Loaded MySQL 4.0.18 w/ KSE running nicely

Thomas Hurst tom at hur.st
Mon Mar 22 09:08:19 PST 2004


* Julian Elischer (julian at elischer.org) wrote:

> On Mon, 22 Mar 2004, Thomas Hurst wrote:
> 
> > Just thought I'd make a little note to let people know that we're
> > successfully running MySQL 4.0.18 on 5.2.1-RELEASE-p3 dated Mar 18 using
> > libkse, after having raised thread limits to 500 per proc/150 per group:
[..]

Spoke too soon; few hours ago we got:

  Fatal trap 12: page fault while in kernel mode
  cpuid = 0; apic id = 01
  fault virtual address   = 0xea3db028
  fault code              = supervisor read, page not present
  instruction pointer     = 0x8:0xc061e937
  stack pointer           = 0x10:0xea3f6d74
  frame pointer           = 0x10:0xbf93499c
  code segment            = base 0x0, limit 0xfffff, type 0x1b
                          = DPL 0, pres 1, def32 1, gran 1
  processor eflags        = resume, IOPL = 0
  current process         = 93103 (mysqld)

We are not amused, especially since the kernel seemed to ignore our
PANIC_REBOOT_WAIT_TIME=5, and now we have MySQL churning through 65
million records, which looks like it's going to take hours.

This seems to be a result of a load spike caused by a cronjob.  We have
DSIZ/SSIZ both set to 1GB; I'm wondering if a 1GB stack is desirable,
given NOTES only has it set to 128M while the DSIZ example is at 1GB...
and I *really* hope it's not a hardware issue.  Given it's got more fans
than the latest boy band and has good quality ECC memory in it, it
shouldn't be...

> it's a pitty we can't see -current
>
> limits are increased to 500 and 1500 and code improved in several
> places.

Hey, we tried :)

> it would also be interesting to see how it differs with the package
> compiled to use process scope threads intead of system scope
> threads. Dan had instructions to do that somewhere I think.

Will look into this.  Further pointers gratefully received :)

> is 142 Queries per second ok or slow? what were you getting before?

About the same.  If it were slower than before I wouldn't have said it
was successful.  And given the latest development, maybe it's not :/

-- 
Thomas 'Freaky' Hurst  -  freaky at aagh.net  -  http://www.aagh.net/


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