[phobos] [D-Programming-Language/phobos] 3cf671: Add std.parallelism.

[David Simcha]

On 4/27/2011 12:10 AM, Brad Roberts wrote:
> It's a dual core amd:
>
> vendor_id       : AuthenticAMD
> cpu family      : 15
> model           : 75
> model name      : AMD Athlon(tm) 64 X2 Dual Core Processor 3800+
> stepping        : 2
> cpu MHz         : 1000.000
> cache size      : 512 KB
> flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht
> syscall nx mmxext fxsr_opt rdtscp lm 3dnowext 3dnow rep_good extd_apicid pni cx16 lahf_lm cmp_legacy svm extapic cr8_legacy
>
> Actually, showing up on one box but not another is strong evidence of a concurrency bug in my experience.  Different
> cpu's at different speeds, with different speed memory and other side components change timings enough to expose bugs
> that otherwise haven't occurred elsewhere.

Also, I found one potential explanation.  I changed at the last minute 
from using my own ASM blocks for atomic loads to core.atomic, now that 
atomicLoad is exposed.  I wrote a wrapper function around it that casts 
stuff to shared.  The way I was doing the cast is probably invalid code 
(because cast(shared) someValue is not an lvalue; look at the latest 
changeset for details) but was being accepted by the compiler and doing 
God only knows what, possibly a non-atomic load at some point.

At any rate, can I have SSH accts on the testers so that if these tests 
fail I'll have access to a computer that can reproduce the failures?