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feat: support CPU profiling via environment variables (#26313)

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Adds environment variable support for enabling CPU profiling without CLI
flags:

- `BUN_CPU_PROFILE=1` — enables the CPU profiler
- `BUN_CPU_PROFILE_DIR=<path>` — sets the output directory for the
profile
- `BUN_CPU_PROFILE_NAME=<name>` — sets the profile file name

These are used as fallbacks when the corresponding `--cpu-prof` CLI
options are not provided. This is useful for profiling in contexts where
modifying the command line isn't practical (e.g. scripts invoked by
other tools).
This commit is contained in:
Dylan Conway
2026-01-20 22:43:36 -08:00
committed by GitHub
parent 08103aa2ff
commit 7f70b01259
3 changed files with 8 additions and 5 deletions
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6
src/bun.js.zig
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@@ -277,12 +277,12 @@ pub const Run = struct {
vm.onUnhandledRejection = &onUnhandledRejectionBeforeClose;
// Start CPU profiler if enabled
if (this.ctx.runtime_options.cpu_prof.enabled) {
if (this.ctx.runtime_options.cpu_prof.enabled or bun.env_var.BUN_CPU_PROFILE.get()) {
const cpu_prof_opts = this.ctx.runtime_options.cpu_prof;
vm.cpu_profiler_config = CPUProfiler.CPUProfilerConfig{
.name = cpu_prof_opts.name,
.dir = cpu_prof_opts.dir,
.name = cpu_prof_opts.name orelse bun.env_var.BUN_CPU_PROFILE_NAME.get() orelse "",
.dir = cpu_prof_opts.dir orelse bun.env_var.BUN_CPU_PROFILE_DIR.get() orelse "",
};
CPUProfiler.startCPUProfiler(vm.jsc_vm);
bun.analytics.Features.cpu_profile += 1;

4
src/cli.zig
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@@ -390,8 +390,8 @@ pub const Command = struct {
console_depth: ?u16 = null,
cpu_prof: struct {
enabled: bool = false,
name: []const u8 = "",
dir: []const u8 = "",
name: ?[]const u8 = null,
dir: ?[]const u8 = null,
} = .{},
};

3
src/env_var.zig
View File

@@ -37,6 +37,9 @@ pub const BUN_CONFIG_DISABLE_ioctl_ficlonerange = New(kind.boolean, "BUN_CONFIG_
///
/// It's unclear why this was done.
pub const BUN_CONFIG_DNS_TIME_TO_LIVE_SECONDS = New(kind.unsigned, "BUN_CONFIG_DNS_TIME_TO_LIVE_SECONDS", .{ .default = 30 });
pub const BUN_CPU_PROFILE = New(kind.boolean, "BUN_CPU_PROFILE", .{ .default = false });
pub const BUN_CPU_PROFILE_DIR = New(kind.string, "BUN_CPU_PROFILE_DIR", .{});
pub const BUN_CPU_PROFILE_NAME = New(kind.string, "BUN_CPU_PROFILE_NAME", .{});
pub const BUN_CRASH_REPORT_URL = New(kind.string, "BUN_CRASH_REPORT_URL", .{});
pub const BUN_DEBUG = New(kind.string, "BUN_DEBUG", .{});
pub const BUN_DEBUG_ALL = New(kind.boolean, "BUN_DEBUG_ALL", .{});