Re: [RFC][PATCH v2 5/5] mutex: Give spinners a chance to spin_on_owner if need_resched() triggered while queued

[Peter Zijlstra <peterz@infradead.org>]

On Thu, Feb 06, 2014 at 08:10:02PM +0000, Norton, Scott J wrote:
> > How do people run this AIM7 piece of shit? I let it run for over an hour
> > and it generated exactly 0 numbers, it just sits there eating cpu-time
> > and creating a racket from my pantry.
> 
> ./reaim -s100  -e2000 -t -j100 -i100 -f workfile.high_systime
> 
> The reaim.config file contains:
> 
> FILESIZE 10k
> POOLSIZE 1m
> DISKDIR /t0
> DISKDIR /t1
> DISKDIR /t2
> DISKDIR /t3
> DISKDIR /t4
> DISKDIR /t5
> DISKDIR /t6
> DISKDIR /t7
> DISKDIR /t8
> DISKDIR /t9
> DISKDIR /t10
> DISKDIR /t11
> DISKDIR /t12
> DISKDIR /t13
> DISKDIR /t14
> DISKDIR /t15
> 
> The way Longman uses this is to create 16 ramdisk filesystems through
> /dev/ram* and then mount those filesystems to the /t* directories.
> Although you could run it through a regular filesystem also. It will use
> whatever you place in the reaim.config file as DISKDIR. You can specify
> one or more DISKDIR directories.

OK, and we're back to creating a racket but not producing useful
numbers; how long is that crap supposed to run before it gives a number?

Surely it can produce a useful number after a few minutes of runtime..
Letting it run for hours is just a waste of time and money.

Note that I'm running this on a WSM-EP with (2*6*2) 24 CPUs and 24G of ram.