----- Original Message ----- > From: Alex Rousskov <rousskov@xxxxxxxxxxxxxxxxxxxxxxx> > To: "squid-users@xxxxxxxxxxxxxxx" <squid-users@xxxxxxxxxxxxxxx> > Cc: > Sent: Saturday, 9 March 2013 11:54 AM > Subject: Re: Squid 3.3.2 and SMP > > On 03/08/2013 07:40 PM, Amm wrote: > > >> Lets say I have two cores and I use "workers 2" in squid.conf. >> >> Squid forks 1st worker and it lands on 1st core. >> But in between some other process starts (or forks) which lands on 2nd core >> Now squid forks 2nd worker and lands on 1st again?! >> >> Is this possible? (kind of race condition) > > Without CPU affinity, processes such as workers change their cores > often. It is normal. You can see that for yourself if you add and watch > "last CPU used" column in "top" on a busy system. Thanks for your replies. I was under impression that once main squid process starts two workers, it depends on OS which core they will run on. (assuming no cpu_affinity given) Once OS assigns them core, they always run on that same core. Did not know that cores keep changing. In short, for best results and to make sure that each worker uses separate core and dont end up using same core, one must use cpu_affinity_map as well? Am I correct? > > HTH, Yes helped a lot. Thanks again. > Alex Amm.
