Re: PHP performance on Xen domU with mulitple vcpu
Emmanuel Dreyfus <[email protected]>
| Newsgroups | gmane.os.netbsd.devel.kernel |
|---|---|
| Message-ID | <[email protected]> |
On Thu, Apr 03, 2025 at 11:00:50AM -0400, Greg Troxel wrote: > Have you written a test program to log and examined the return values? I ran gettimeofday 1M time, it took 5.12, which is much faster than what happens in PHP. Here is the distribution of results: count value 239726 1743694322.907498 119400 1743694324.187487 327599 1743694325.467476 174425 1743694326.747465 138850 1743694328.027453 > Is xen somehow using a timecounter that is incrementing in larger jumps? Oh, yes, good pick! I use kern.timecounter.hardware=clockinterrupt because with xen_system_time the domU's ntpd is unable to keep in sync. With kern.timecounter.hardware=xen_system_time, the uniqid() test runs at normal speed. -- Emmanuel Dreyfus [email protected]