On Thu, Nov 15, 2012 at 10:41 AM, Anton Whalley
<anton.whal...@nearform.com> wrote:
> Can you put it on an illumOS based system temporarily and get DTracing?
> At the very least this would tell you if its infrastructure or application.
>
> Spin up a Joyent SmartOS or do a local install of OpenIndiana.
> Then install your app
>
> This d script will show you when garbage collection is starting and how long
> it takes.
>
>
> node*:::gc-start
> {
> self->ts = timestamp;
> }
>
> node*:::gc-done
> {
> printf("Garbage Collection - [%Y] - %d",
> walltimestamp,
> timestamp - self->ts);
> self->ts = 0
> }
In that vein, if you're on a semi-recent RHEL-based system (CentOS,
Fedora), you can use this systemtap script. It prints aggregated GC
statistics every 5 seconds and at program exit. Run with `sudo stap
gc.stp -c 'node script.js'`.
Note that systemtap support currently only exists in master.
Debian/Ubuntu probably won't work, the systemtap in the official
repositories is too old.
#!/usr/bin/env stap
global samples
global all_samples
global timestamp
probe process("node").mark("gc__start")
{
timestamp = gettimeofday_us()
}
probe process("node").mark("gc__done")
{
sample = gettimeofday_us() - timestamp
samples <<< sample
all_samples <<< sample
}
probe timer.s(5)
{
print(@hist_log(samples))
printf("min:%d avg:%d max:%d count:%d\n",
@min(samples), @avg(samples),
@max(samples), @count(samples))
delete samples
}
probe end
{
print(@hist_log(all_samples))
printf("min:%d avg:%d max:%d count:%d\n",
@min(all_samples), @avg(all_samples),
@max(all_samples), @count(all_samples))
}
As a gist: https://gist.github.com/4078925
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