ywkaras commented on issue #7546:
URL: https://github.com/apache/trafficserver/issues/7546#issuecomment-790235752
I've been able to cause a bottleneck in LogObject::_checkout_write() on the
AMD host, using open source TS (commit
5c65bcb4d0739cbadd09fab3d836110d529d48d2). I had to set
proxy.config.exec_thread.autoconfig.scale to 2.0 . I ran TS (without manager)
with this command:
```
TS_ROOT=$PWD LD_LIBRARY_PATH=$PWD/lib bin/traffic_server -f -F &
```
To see the bottleneck, I have to start with a empty log directory. I have
to run 10 h2load processes at once with this script:
```
do_h2()
{
/home/wkaras/h2load --h1 -t 64 -D 60 -c 512 http://localhost:80$1/fake >
~/80$1.log &
}
rm -f ~/80*.log
for P in $( seq 81 90 )
do
do_h2 $P
done
```
"fake" is 1024 byte object that I create with a PUSH. When I run "perf
top", I see about 95% of CPU time being spent in _checkout_write. But, the
bottleneck gradually disappears, the % of CPU time drops (as squid.log gets
full?).
For unknown reasons, I sometimes see the (disappearing) bottleneck in
HttpTransact::OriginDead() instead of LogObject::_checkout_write().
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