Re: [HACKERS] kqueue

Hi Thomas,

On 30/09/2018 04:36, Thomas Munro wrote:
> On Sat, Sep 29, 2018 at 7:51 PM Matteo Beccati <php@beccati.com> wrote:
>> Out of curiosity, I've installed FreBSD on an identically specced VM,
>> and the select benchmark was ~75k tps for kqueue vs ~90k tps on
>> unpatched master, so maybe there's something wrong I'm doing when
>> benchmarking. Could you please provide proper instructions?
> 
> Ouch.  What kind of virtualisation is this?  Which version of FreeBSD?
>  Not sure if it's relevant, but do you happen to see gettimeofday()
> showing up as a syscall, if you truss a backend running pgbench?

I downloaded 11.2 as VHD file in order to run on MS Hyper-V / Win10 Pro.

Yes, I saw plenty of gettimeofday calls when running truss:

> gettimeofday({ 1538297117.071344 },0x0)          = 0 (0x0)
> gettimeofday({ 1538297117.071743 },0x0)          = 0 (0x0)
> gettimeofday({ 1538297117.072021 },0x0)          = 0 (0x0)
> getpid()                                         = 766 (0x2fe)
> __sysctl(0x7fffffffce90,0x4,0x0,0x0,0x801891000,0x2b) = 0 (0x0)
> gettimeofday({ 1538297117.072944 },0x0)          = 0 (0x0)
> getpid()                                         = 766 (0x2fe)
> __sysctl(0x7fffffffce90,0x4,0x0,0x0,0x801891000,0x29) = 0 (0x0)
> gettimeofday({ 1538297117.073682 },0x0)          = 0 (0x0)
> sendto(9,"2\0\0\0\^DT\0\0\0!\0\^Aabalance"...,71,0,NULL,0) = 71 (0x47)
> recvfrom(9,"B\0\0\0\^\\0P0_1\0\0\0\0\^A\0\0"...,8192,0,NULL,0x0) = 51 (0x33)
> gettimeofday({ 1538297117.074955 },0x0)          = 0 (0x0)
> gettimeofday({ 1538297117.075308 },0x0)          = 0 (0x0)
> getpid()                                         = 766 (0x2fe)
> __sysctl(0x7fffffffce90,0x4,0x0,0x0,0x801891000,0x29) = 0 (0x0)
> gettimeofday({ 1538297117.076252 },0x0)          = 0 (0x0)
> gettimeofday({ 1538297117.076431 },0x0)          = 0 (0x0)
> gettimeofday({ 1538297117.076678 },0x0^C)                = 0 (0x0)



Cheers
-- 
Matteo Beccati

Development & Consulting - http://www.beccati.com/