tiny.profiling.recovery
Defined in tiny.profiling.
API (1)
Actions
Public operations.
Source
Source: src/profiling/recovery.zig
zig
const std = @import("std");const pretty = @import("pretty");const pretty_usage = @import("pretty_usage");const sys = @import("sys");const Allocator = std.mem.Allocator;const fs_io = std.Options.debug_io;const source_schema = "tiny.profiling.recovery-curves/v1";const result_schema = "tiny.profiling.recovery-capacity/v1";const bootstrap_method = "within_point_resample_then_median_then_ordinary_least_squares";const maximum_source_bytes = 8 * 1024 * 1024;const maximum_arguments = 64;const maximum_projections = 16;const maximum_components = 8;const maximum_samples = 4096;const maximum_exact_float_integer: u64 = 1 << 53;const history_remedy = "Archive verified immutable history segments to a replayable checksummed tier. " ++ "Publish its receipt before releasing local segments, then retry.";const tracker_cold_remedy = "Compact only the derived database and indexes from retained canonical history. " ++ "Archive verified history segments if needed, then retry.";const Operation = enum { sql_history_replay, tracker_cold_open, tracker_history_rebuild, fn parse(text: []const u8) !Operation { if (std.mem.eql(u8, text, "sql.history.replay")) return .sql_history_replay; if (std.mem.eql(u8, text, "tracker.cold_open")) return .tracker_cold_open; if (std.mem.eql(u8, text, "tracker.history_rebuild")) { return .tracker_history_rebuild; } return error.UnknownRecoveryOperation; } fn name(self: Operation) []const u8 { return switch (self) { .sql_history_replay => "sql.history.replay", .tracker_cold_open => "tracker.cold_open", .tracker_history_rebuild => "tracker.history_rebuild", }; }};const operation_order = [_]Operation{ .sql_history_replay, .tracker_cold_open, .tracker_history_rebuild,};const Sample = struct { acquisition_position: u32, duration_ns: u64,};const Point = struct { state_bytes: u64, samples_ns_by_acquisition: []const Sample,};const Bound = struct { confidence: f64, finite: bool, intercept_ns: f64, iterations: u32, method: []const u8, operation_seed: u64, seed: u64, slope_ns_per_byte: f64,};const Curve = struct { operation: []const u8, bootstrap_upper_confidence_bound: Bound, point_count: u32, points: []const Point, samples_per_point: u32,};const BuildEnvironment = struct { optimize: []const u8 };const HostEnvironment = struct { arch: []const u8, cpu_count: u32, cpu_model: []const u8, hostname: []const u8, kernel: []const u8, os: []const u8,};const ZigEnvironment = struct { version: []const u8 };const Environment = struct { build: BuildEnvironment, host: HostEnvironment, zig: ZigEnvironment,};const Acquisition = struct { measure_repeat: u32, method: []const u8, position_range: [2]u32, seed: u64, warmup_repeat: u32,};const Admission = struct { admitted_samples: u32, cache_state: []const u8, correctness: []const u8, expected_samples: u32, process_state: []const u8, slo_enforced: bool,};const Evidence = struct { schema: []const u8, run_id: []const u8, source_manifest: []const u8, environment: Environment, acquisition: Acquisition, admission: Admission, curves: []const Curve,};const Limiter = enum { measured_range, slo };const Capacity = struct { operation: Operation, measured_min_bytes: u64, measured_max_bytes: u64, capacity_bytes: u64, slo_crossing_bytes: ?u64, upper_bound_ns: f64, margin_ns: f64, limiter: Limiter,};const Component = struct { source: []const u8, bytes: u64,};const Projection = struct { label: []const u8, operation: Operation, bytes: u64 = 0, components: [maximum_components]Component = undefined, component_count: usize = 0,};const ProjectionStatus = enum { admitted, reject_outside_measured_range, reject_slo,};const ProjectionResult = struct { projection: Projection, capacity: Capacity, status: ProjectionStatus, forecast_upper_ns: ?f64,};const Options = struct { source_path: ?[]const u8 = null, slo_ms: ?u64 = null, json: bool = false, projections: [maximum_projections]Projection = undefined, projection_count: usize = 0,};const Analysis = struct { source_path: []const u8, source_sha256: [std.crypto.hash.sha2.Sha256.digest_length]u8, evidence: Evidence, slo_ns: u64, capacities: [operation_order.len]Capacity, projections: [maximum_projections]ProjectionResult = undefined, projection_count: usize = 0,};pub fn run(allocator: Allocator, args: []const []const u8) !u8 { const options = try parseOptions(args); const source_path = options.source_path orelse return error.MissingRecoveryCurvePath; const slo_ms = options.slo_ms orelse return error.MissingRecoverySlo; const slo_ns = std.math.mul(u64, slo_ms, std.time.ns_per_ms) catch { return error.RecoverySloOverflow; }; if (slo_ns == 0 or slo_ns > maximum_exact_float_integer) { return error.InvalidRecoverySlo; } const source = try sys.fs.readFileAlloc(allocator, source_path, maximum_source_bytes); const evidence = try std.json.parseFromSliceLeaky(Evidence, allocator, source, .{ .ignore_unknown_fields = true, }); try validateEvidence(evidence); var analysis = Analysis{ .source_path = source_path, .source_sha256 = undefined, .evidence = evidence, .slo_ns = slo_ns, .capacities = try deriveCapacities(evidence, slo_ns), }; std.crypto.hash.sha2.Sha256.hash(source, &analysis.source_sha256, .{}); try projectStores(&analysis, options.projections[0..options.projection_count]); if (options.json) { try writeJson(analysis); } else { try writeHuman(allocator, analysis); } return 0;}fn parseOptions(args: []const []const u8) !Options { if (args.len > maximum_arguments) return error.TooManyRecoveryArguments; std.debug.assert(args.len <= maximum_arguments); var options = Options{}; var index: usize = 0; while (index < args.len) : (index += 1) { const arg = args[index]; if (std.mem.eql(u8, arg, "--json")) { options.json = true; } else if (std.mem.eql(u8, arg, "--slo-ms")) { index += 1; if (index >= args.len) return error.MissingRecoverySlo; options.slo_ms = try parsePositive(args[index]); } else if (std.mem.startsWith(u8, arg, "--slo-ms=")) { options.slo_ms = try parsePositive(arg["--slo-ms=".len..]); } else if (std.mem.eql(u8, arg, "--project-file")) { index += 1; if (index >= args.len) return error.MissingRecoveryProjection; try addProjectionSpec(&options, args[index], true); } else if (std.mem.eql(u8, arg, "--project-bytes")) { index += 1; if (index >= args.len) return error.MissingRecoveryProjection; try addProjectionSpec(&options, args[index], false); } else if (std.mem.startsWith(u8, arg, "-")) { return error.UnknownRecoveryOption; } else if (options.source_path == null) { options.source_path = arg; } else { return error.UnexpectedRecoveryArgument; } } std.debug.assert(options.projection_count <= maximum_projections); return options;}fn addProjectionSpec(options: *Options, spec: []const u8, file: bool) !void { const label_end = std.mem.indexOfScalar(u8, spec, '=') orelse { return error.InvalidRecoveryProjection; }; const operation_start = label_end + 1; const separator_offset = std.mem.indexOfScalar(u8, spec[operation_start..], ':') orelse { return error.InvalidRecoveryProjection; }; const value_start = operation_start + separator_offset + 1; const label = spec[0..label_end]; const operation_text = spec[operation_start .. value_start - 1]; const value = spec[value_start..]; if (label.len == 0 or label.len > 64 or value.len == 0) { return error.InvalidRecoveryProjection; } const operation = try Operation.parse(operation_text); const bytes = if (file) try fileBytes(value) else try parseBytes(value); try addProjection(options, label, operation, .{ .source = value, .bytes = bytes });}fn fileBytes(path: []const u8) !u64 { const stat = try sys.fs.statFile(path); if (stat.kind != .file) return error.RecoveryProjectionNotFile; return stat.size;}fn parsePositive(text: []const u8) !u64 { const value = std.fmt.parseUnsigned(u64, text, 10) catch { return error.InvalidRecoverySlo; }; if (value == 0) return error.InvalidRecoverySlo; return value;}fn parseBytes(text: []const u8) !u64 { return std.fmt.parseUnsigned(u64, text, 10) catch { return error.InvalidRecoveryProjectionBytes; };}fn addProjection( options: *Options, label: []const u8, operation: Operation, component: Component,) !void { std.debug.assert(options.projection_count <= maximum_projections); for (options.projections[0..options.projection_count]) |*projection| { if (!std.mem.eql(u8, projection.label, label)) continue; if (projection.operation != operation) return error.ProjectionOperationMismatch; return try appendComponent(projection, component); } if (options.projection_count == maximum_projections) { return error.TooManyRecoveryProjections; } const projection = &options.projections[options.projection_count]; projection.* = .{ .label = label, .operation = operation }; options.projection_count += 1; try appendComponent(projection, component);}fn appendComponent(projection: *Projection, component: Component) !void { std.debug.assert(projection.component_count <= maximum_components); if (projection.component_count == maximum_components) { return error.TooManyRecoveryProjectionComponents; } projection.bytes = std.math.add(u64, projection.bytes, component.bytes) catch { return error.RecoveryProjectionOverflow; }; projection.components[projection.component_count] = component; projection.component_count += 1;}fn validateEvidence(evidence: Evidence) !void { if (!std.mem.eql(u8, evidence.schema, source_schema)) return error.InvalidRecoverySchema; if (evidence.run_id.len == 0 or evidence.source_manifest.len == 0) { return error.IncompleteRecoveryProvenance; } if (!std.mem.eql(u8, evidence.environment.build.optimize, "ReleaseFast")) { return error.InvalidRecoveryBuildMode; } try validateEnvironment(evidence.environment); if (!std.mem.eql(u8, evidence.acquisition.method, "random_interleaved") or evidence.acquisition.measure_repeat == 0 or evidence.acquisition.warmup_repeat != 0) { return error.InvalidRecoveryAcquisition; } try validateAdmission(evidence); try validateCurves(evidence);}fn validateEnvironment(environment: Environment) !void { const host = environment.host; if (host.arch.len == 0 or host.cpu_count == 0 or host.cpu_model.len == 0 or host.hostname.len == 0 or host.kernel.len == 0 or host.os.len == 0 or environment.zig.version.len == 0) { return error.IncompleteRecoveryEnvironment; }}fn validateAdmission(evidence: Evidence) !void { const admission = evidence.admission; if (!std.mem.eql(u8, admission.process_state, "process_cold") or !std.mem.eql(u8, admission.cache_state, "warm") or !std.mem.eql(u8, admission.correctness, "all_admitted") or admission.slo_enforced or admission.expected_samples == 0 or admission.admitted_samples != admission.expected_samples) { return error.InvalidRecoveryAdmission; } if (evidence.acquisition.position_range[0] != 1 or evidence.acquisition.position_range[1] != admission.expected_samples) { return error.InvalidRecoveryAcquisitionRange; }}fn validateCurves(evidence: Evidence) !void { if (evidence.curves.len != operation_order.len) return error.IncompleteRecoveryCurves; if (evidence.admission.expected_samples > maximum_samples) { return error.TooManyRecoverySamples; } std.debug.assert(evidence.curves.len == operation_order.len); var seen: [operation_order.len]bool = @splat(false); var positions: [maximum_samples]bool = undefined; @memset(positions[0..], false); var total_samples: u64 = 0; const reference_bound = evidence.curves[0].bootstrap_upper_confidence_bound; for (evidence.curves) |curve| { const operation = try Operation.parse(curve.operation); const operation_index = @backingInt(operation); if (seen[operation_index]) return error.DuplicateRecoveryCurve; seen[operation_index] = true; try validateCurve(curve, evidence, reference_bound, &positions); total_samples = try std.math.add( u64, total_samples, @as(u64, curve.point_count) * curve.samples_per_point, ); } if (total_samples != evidence.admission.expected_samples) { return error.InvalidRecoverySampleCount; } for (positions[0..evidence.admission.expected_samples]) |present| { if (!present) return error.InvalidRecoveryAcquisitionPositions; }}fn validateCurve( curve: Curve, evidence: Evidence, reference_bound: Bound, positions: *[maximum_samples]bool,) !void { if (curve.point_count < 2 or curve.point_count != curve.points.len or curve.samples_per_point != evidence.acquisition.measure_repeat) { return error.InvalidRecoveryCurveShape; } std.debug.assert(curve.points.len >= 2); const bound = curve.bootstrap_upper_confidence_bound; if (!bound.finite or !std.math.isFinite(bound.intercept_ns) or !std.math.isFinite(bound.slope_ns_per_byte) or bound.intercept_ns < 0 or bound.slope_ns_per_byte <= 0 or bound.confidence <= 0 or bound.confidence >= 1 or bound.iterations == 0 or bound.seed != evidence.acquisition.seed or bound.operation_seed == 0 or bound.confidence != reference_bound.confidence or bound.iterations != reference_bound.iterations or !std.mem.eql(u8, bound.method, bootstrap_method)) { return error.InvalidRecoveryConfidenceBound; } var previous: u64 = 0; for (curve.points) |point| { if (point.state_bytes <= previous or point.state_bytes > maximum_exact_float_integer or point.samples_ns_by_acquisition.len != curve.samples_per_point) { return error.InvalidRecoveryCurvePoint; } previous = point.state_bytes; try validateSamples(point.samples_ns_by_acquisition, evidence, positions); }}fn validateSamples( samples: []const Sample, evidence: Evidence, positions: *[maximum_samples]bool,) !void { for (samples) |sample| { if (sample.duration_ns == 0 or sample.acquisition_position < evidence.acquisition.position_range[0] or sample.acquisition_position > evidence.acquisition.position_range[1]) { return error.InvalidRecoverySample; } const index = sample.acquisition_position - 1; if (positions[index]) return error.DuplicateRecoveryAcquisitionPosition; positions[index] = true; }}fn deriveCapacities(evidence: Evidence, slo_ns: u64) ![operation_order.len]Capacity { std.debug.assert(slo_ns > 0); std.debug.assert(slo_ns <= maximum_exact_float_integer); var capacities: [operation_order.len]Capacity = undefined; for (operation_order, 0..) |operation, index| { const curve = findCurve(evidence.curves, operation) orelse { return error.IncompleteRecoveryCurves; }; capacities[index] = try deriveCapacity(operation, curve, slo_ns); } return capacities;}fn findCurve(curves: []const Curve, operation: Operation) ?Curve { for (curves) |curve| { const actual = Operation.parse(curve.operation) catch continue; if (actual == operation) return curve; } return null;}fn deriveCapacity(operation: Operation, curve: Curve, slo_ns: u64) !Capacity { std.debug.assert(curve.points.len >= 2); std.debug.assert(slo_ns > 0); std.debug.assert(slo_ns <= maximum_exact_float_integer); const minimum = curve.points[0].state_bytes; const maximum = curve.points[curve.points.len - 1].state_bytes; const bound = curve.bootstrap_upper_confidence_bound; const minimum_upper = predict(bound, minimum); const maximum_upper = predict(bound, maximum); if (minimum_upper > @as(f64, @floatFromInt(slo_ns))) { return error.RecoverySloBelowMeasuredRange; } if (maximum_upper <= @as(f64, @floatFromInt(slo_ns))) { return finishCapacity(operation, minimum, maximum, maximum, null, maximum_upper, slo_ns); } const remaining = @as(f64, @floatFromInt(slo_ns)) - bound.intercept_ns; const crossing_float = @floor(remaining / bound.slope_ns_per_byte); if (!std.math.isFinite(crossing_float) or crossing_float < 0 or crossing_float > @as(f64, @floatFromInt(maximum_exact_float_integer))) { return error.InvalidRecoveryCapacity; } const crossing: u64 = @intFromFloat(crossing_float); if (crossing < minimum or crossing >= maximum) return error.InvalidRecoveryCapacity; return finishCapacity( operation, minimum, maximum, crossing, crossing, predict(bound, crossing), slo_ns, );}fn finishCapacity( operation: Operation, minimum: u64, maximum: u64, capacity: u64, crossing: ?u64, upper_ns: f64, slo_ns: u64,) !Capacity { std.debug.assert(minimum <= maximum); const slo_float = @as(f64, @floatFromInt(slo_ns)); if (capacity < minimum or capacity > maximum or upper_ns > slo_float) { return error.InvalidRecoveryCapacity; } const result = Capacity{ .operation = operation, .measured_min_bytes = minimum, .measured_max_bytes = maximum, .capacity_bytes = capacity, .slo_crossing_bytes = crossing, .upper_bound_ns = upper_ns, .margin_ns = slo_float - upper_ns, .limiter = if (crossing == null) .measured_range else .slo, }; try verifyGrowthGate(result); return result;}fn verifyGrowthGate(capacity: Capacity) !void { var local_bytes = capacity.capacity_bytes; if (applyGrowth(&local_bytes, 0, capacity) != .admitted or local_bytes != capacity.capacity_bytes) { return error.InvalidRecoveryMaximumGate; } if (applyGrowth(&local_bytes, 1, capacity) != .rejected or local_bytes != capacity.capacity_bytes) { return error.InvalidRecoveryMaximumPlusOneGate; }}fn predict(bound: Bound, bytes: u64) f64 { std.debug.assert(bytes <= maximum_exact_float_integer); return bound.intercept_ns + bound.slope_ns_per_byte * @as(f64, @floatFromInt(bytes));}fn projectStores(analysis: *Analysis, projections: []const Projection) !void { std.debug.assert(projections.len <= maximum_projections); for (projections) |projection| { const capacity = analysis.capacities[@backingInt(projection.operation)]; const inside = projection.bytes >= capacity.measured_min_bytes and projection.bytes <= capacity.measured_max_bytes; const status: ProjectionStatus = if (!inside) .reject_outside_measured_range else if (projection.bytes > capacity.capacity_bytes) .reject_slo else .admitted; analysis.projections[analysis.projection_count] = .{ .projection = projection, .capacity = capacity, .status = status, .forecast_upper_ns = if (inside) predict(findBound(analysis.evidence, projection.operation), projection.bytes) else null, }; analysis.projection_count += 1; }}fn findBound(evidence: Evidence, operation: Operation) Bound { const curve = findCurve(evidence.curves, operation) orelse unreachable; return curve.bootstrap_upper_confidence_bound;}fn remedy(operation: Operation) []const u8 { return switch (operation) { .sql_history_replay, .tracker_history_rebuild => history_remedy, .tracker_cold_open => tracker_cold_remedy, };}fn statusName(status: ProjectionStatus) []const u8 { return switch (status) { .admitted => "admitted", .reject_outside_measured_range => "reject_outside_measured_range", .reject_slo => "reject_slo", };}fn limiterName(limiter: Limiter) []const u8 { return switch (limiter) { .measured_range => "measured_range", .slo => "slo", };}fn writeJson(analysis: Analysis) !void { var buffer: [8192]u8 = undefined; var stdout_writer = sys.stdio.stdout().writer(fs_io, &buffer); const writer = &stdout_writer.interface; var json = pretty.json.Writer.init(writer, .indent_2); try json.beginObject(); try writeJsonHeader(&json, analysis); try writeJsonCapacities(&json, analysis); try writeJsonProjections(&json, analysis); try json.endObject(); try writer.writeByte('\n'); try writer.flush();}fn writeJsonHeader(json: *pretty.json.Writer, analysis: Analysis) !void { const digest_hex = std.fmt.bytesToHex(analysis.source_sha256, .lower); try json.objectField("schema"); try json.write(result_schema); try json.objectField("source"); try json.beginObject(); try json.objectField("path"); try json.write(analysis.source_path); try json.objectField("sha256"); try json.write(&digest_hex); try json.objectField("schema"); try json.write(analysis.evidence.schema); try json.objectField("run_id"); try json.write(analysis.evidence.run_id); try json.objectField("manifest"); try json.write(analysis.evidence.source_manifest); try json.endObject(); try writeJsonPremises(json, analysis);}fn writeJsonPremises(json: *pretty.json.Writer, analysis: Analysis) !void { const evidence = analysis.evidence; const bound = evidence.curves[0].bootstrap_upper_confidence_bound; try json.objectField("premises"); try json.beginObject(); try json.objectField("slo_ns"); try json.write(analysis.slo_ns); try json.objectField("process_state"); try json.write(evidence.admission.process_state); try json.objectField("filesystem_cache_state"); try json.write(evidence.admission.cache_state); try json.objectField("optimize"); try json.write(evidence.environment.build.optimize); try json.objectField("acquisition_method"); try json.write(evidence.acquisition.method); try json.objectField("confidence"); try json.write(bound.confidence); try json.objectField("bootstrap_iterations"); try json.write(bound.iterations); try json.objectField("host"); try writeJsonHost(json, evidence); try json.endObject();}fn writeJsonHost(json: *pretty.json.Writer, evidence: Evidence) !void { const host = evidence.environment.host; try json.beginObject(); try json.objectField("hostname"); try json.write(host.hostname); try json.objectField("os"); try json.write(host.os); try json.objectField("kernel"); try json.write(host.kernel); try json.objectField("arch"); try json.write(host.arch); try json.objectField("cpu_model"); try json.write(host.cpu_model); try json.objectField("cpu_count"); try json.write(host.cpu_count); try json.objectField("zig"); try json.write(evidence.environment.zig.version); try json.endObject();}fn writeJsonCapacities(json: *pretty.json.Writer, analysis: Analysis) !void { std.debug.assert(analysis.capacities.len == operation_order.len); try json.objectField("capacities"); try json.beginArray(); for (analysis.capacities) |capacity| { try json.beginObject(); try json.objectField("operation"); try json.write(capacity.operation.name()); try json.objectField("measured_min_bytes"); try json.write(capacity.measured_min_bytes); try json.objectField("measured_max_bytes"); try json.write(capacity.measured_max_bytes); try json.objectField("capacity_bytes"); try json.write(capacity.capacity_bytes); try json.objectField("slo_crossing_bytes"); try json.write(capacity.slo_crossing_bytes); try json.objectField("upper_confidence_bound_ns"); try json.write(capacity.upper_bound_ns); try json.objectField("slo_margin_ns"); try json.write(capacity.margin_ns); try json.objectField("limiter"); try json.write(limiterName(capacity.limiter)); try json.objectField("max_gate"); try json.write("pass"); try json.objectField("max_plus_one_gate"); try json.write("reject_before_local_growth"); try json.objectField("max_plus_one_remedy"); try json.write(remedy(capacity.operation)); try json.endObject(); } try json.endArray();}fn writeJsonProjections(json: *pretty.json.Writer, analysis: Analysis) !void { try json.objectField("projections"); try json.beginArray(); var all_admitted = true; for (analysis.projections[0..analysis.projection_count]) |projection| { if (projection.status != .admitted) all_admitted = false; try writeJsonProjection(json, projection); } try json.endArray(); try json.objectField("all_projections_admitted"); try json.write(all_admitted);}fn writeJsonProjection(json: *pretty.json.Writer, result: ProjectionResult) !void { const projection = result.projection; try json.beginObject(); try json.objectField("label"); try json.write(projection.label); try json.objectField("operation"); try json.write(projection.operation.name()); try json.objectField("state_bytes"); try json.write(projection.bytes); try json.objectField("capacity_bytes"); try json.write(result.capacity.capacity_bytes); try json.objectField("within_measured_range"); try json.write(result.status != .reject_outside_measured_range); try json.objectField("forecast_upper_ns"); try json.write(result.forecast_upper_ns); try json.objectField("status"); try json.write(statusName(result.status)); try json.objectField("remedy"); try json.write(if (result.status == .admitted) null else remedy(projection.operation)); try writeJsonComponents(json, projection); try json.endObject();}fn writeJsonComponents(json: *pretty.json.Writer, projection: Projection) !void { try json.objectField("components"); try json.beginArray(); for (projection.components[0..projection.component_count]) |component| { try json.beginObject(); try json.objectField("source"); try json.write(component.source); try json.objectField("bytes"); try json.write(component.bytes); try json.endObject(); } try json.endArray();}fn writeHuman(allocator: Allocator, analysis: Analysis) !void { var report = try buildReport(allocator, analysis); defer report.deinit(); const rendered = try report.renderAlloc(.{ .width = 100 }); var terminal = pretty_usage.Terminal.stdout(allocator, .{}); try terminal.writeText(rendered); try terminal.writeText("\n");}fn buildReport(allocator: Allocator, analysis: Analysis) !pretty.diagnostic.Report { std.debug.assert(analysis.projection_count <= maximum_projections); var report = try pretty.diagnostic.Report.init(allocator, "recovery capacity gate"); errdefer report.deinit(); try report.field("SLO", "{d} ms", .{analysis.slo_ns / std.time.ns_per_ms}); try report.field("process", "{s}", .{analysis.evidence.admission.process_state}); try report.field("filesystem cache", "{s}", .{analysis.evidence.admission.cache_state}); try report.field("host", "{s}", .{analysis.evidence.environment.host.cpu_model}); try report.field("kernel", "{s}", .{analysis.evidence.environment.host.kernel}); try report.field("build", "{s}", .{analysis.evidence.environment.build.optimize}); try report.field( "bound", "{d:.0}% confidence, {d} bootstrap iterations", .{ analysis.evidence.curves[0].bootstrap_upper_confidence_bound.confidence * 100, analysis.evidence.curves[0].bootstrap_upper_confidence_bound.iterations, }, ); try report.section("provisional capacities"); for (analysis.capacities) |capacity| try writeCapacityLine(&report, capacity); try report.section("store projections"); if (analysis.projection_count == 0) try report.line("none supplied", .{}); for (analysis.projections[0..analysis.projection_count]) |projection| { try report.line( "{s}: {s}, {d} bytes, {s}", .{ projection.projection.label, projection.projection.operation.name(), projection.projection.bytes, statusName(projection.status), }, ); } try writeRemedies(&report, analysis); return report;}fn writeCapacityLine(report: *pretty.diagnostic.Report, capacity: Capacity) !void { try report.line( "{s}: {d} bytes, range {d}..{d}, upper {d:.3} ms, margin {d:.3} ms, {s}", .{ capacity.operation.name(), capacity.capacity_bytes, capacity.measured_min_bytes, capacity.measured_max_bytes, capacity.upper_bound_ns / std.time.ns_per_ms, capacity.margin_ns / std.time.ns_per_ms, limiterName(capacity.limiter), }, );}fn writeRemedies(report: *pretty.diagnostic.Report, analysis: Analysis) !void { var wrote_heading = false; for (analysis.projections[0..analysis.projection_count]) |projection| { if (projection.status == .admitted) continue; if (!wrote_heading) { try report.section("reject with remedy"); wrote_heading = true; } try report.line( "{s}: {s}", .{ projection.projection.label, remedy(projection.projection.operation) }, ); }}const GrowthDecision = enum { admitted, rejected };fn applyGrowth(local_bytes: *u64, growth_bytes: u64, capacity: Capacity) GrowthDecision { const next = std.math.add(u64, local_bytes.*, growth_bytes) catch return .rejected; if (next > capacity.capacity_bytes) return .rejected; local_bytes.* = next; return .admitted;}test "recovery capacity admits max and rejects max plus one before growth" { const capacity = Capacity{ .operation = .sql_history_replay, .measured_min_bytes = 10, .measured_max_bytes = 100, .capacity_bytes = 100, .slo_crossing_bytes = null, .upper_bound_ns = 90, .margin_ns = 10, .limiter = .measured_range, }; var local_bytes: u64 = 99; try std.testing.expectEqual(GrowthDecision.admitted, applyGrowth(&local_bytes, 1, capacity)); try std.testing.expectEqual(@as(u64, 100), local_bytes); try std.testing.expectEqual(GrowthDecision.rejected, applyGrowth(&local_bytes, 1, capacity)); try std.testing.expectEqual(@as(u64, 100), local_bytes);}test "recovery measured maximum limits a crossing outside evidence" { const samples = [_]Sample{ .{ .acquisition_position = 1, .duration_ns = 1 }, .{ .acquisition_position = 2, .duration_ns = 1 }, }; const points = [_]Point{ .{ .state_bytes = 10, .samples_ns_by_acquisition = &samples }, .{ .state_bytes = 100, .samples_ns_by_acquisition = &samples }, }; const curve = Curve{ .operation = "sql.history.replay", .bootstrap_upper_confidence_bound = .{ .confidence = 0.95, .finite = true, .intercept_ns = 10, .iterations = 10, .method = bootstrap_method, .operation_seed = 2, .seed = 1, .slope_ns_per_byte = 0.5, }, .point_count = 2, .points = &points, .samples_per_point = 2, }; const capacity = try deriveCapacity(.sql_history_replay, curve, 100); try std.testing.expectEqual(@as(u64, 100), capacity.capacity_bytes); try std.testing.expectEqual(Limiter.measured_range, capacity.limiter); try std.testing.expectEqual(@as(?u64, null), capacity.slo_crossing_bytes);}test "recovery rejection remedies preserve replayable canonical state" { try std.testing.expect(std.mem.indexOf(u8, remedy(.sql_history_replay), "replayable") != null); try std.testing.expect(std.mem.indexOf(u8, remedy(.sql_history_replay), "checksummed") != null); try std.testing.expect(std.mem.indexOf(u8, remedy(.tracker_cold_open), "derived") != null); try std.testing.expect(std.mem.indexOf(u8, remedy(.tracker_cold_open), "canonical") != null);}Source: src/profiling/root.zig:40
zig
pub const recovery = @import("recovery.zig");Audit
| Definitions | 2 |
|---|---|
| Public names | 2 |
| Members | 0 |
| Version | 26.7.0 |
| Revision | daab053ee433 |