• =?UTF-8?Q?Ali_=c3=87ehreli?= (5/5) Mar 01 2022 Have you tried this new GC option which seems to solve the
• Anonymouse (6/11) Mar 02 2022 It didn't work well for me; the process hung in
• =?UTF-8?Q?Ali_=c3=87ehreli?= (12/15) Mar 02 2022 And it showed worse pause performance in a micro-benchmark program that

=?UTF-8?Q?Ali_=c3=87ehreli?= <acehreli yahoo.com> writes:

Have you tried this new GC option which seems to solve the 
stop-the-world issue:

   https://dlang.org/changelog/2.098.0.html#forkgc

Any experience?

Ali

Anonymouse <zorael gmail.com> writes:

On Tuesday, 1 March 2022 at 21:32:07 UTC, Ali Çehreli wrote:
 Have you tried this new GC option which seems to solve the 
 stop-the-world issue:

   https://dlang.org/changelog/2.098.0.html#forkgc

 Any experience?

 Ali

It didn't work well for me; the process hung in 
`__memcpy_avx_unaligned_erms` when profiling under 
valgrind/callgrind, during the first collection. I tried and 
failed to reproduce it with a minimal example, so I didn't file 
an issue.

=?UTF-8?Q?Ali_=c3=87ehreli?= <acehreli yahoo.com> writes:

On 3/2/22 07:11, Anonymouse wrote:

 It didn't work well for me; the process hung in
 `__memcpy_avx_unaligned_erms` when profiling under valgrind/callgrind,
 during the first collection.

And it showed worse pause performance in a micro-benchmark program that 
I wrote that ran only for 10 seconds. But perhaps that worse pause was 
only on one of the threads so maybe I was better overall. (?)

Before getting to conclusions, does anyone have a GC benchmark program 
that demonstrates issues with D's GC? I am thinking, a separate driver 
program can pipeProcess() the benchmark program and measure pipe 
interaction latency. However, I am not convinced the benchmark program I 
wrote causes long pauses: The GC profiler reports 6ms (or so) pauses at 
most. Can we write a program that puts the blame on D's GC.

Thank you,
Ali