[petsc-dev] Seeking OLCF users complaining about poor build times

[Victor Eijkhout]

> On Feb 26, 2015, at 5:48 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:
> 
>  What is a "login node"? Is it a node you log in to compile code? So its purpose is pretty much only to compile code?

Compile, submit batch jobs, minimal postprocessing.

> What kind of load does it have? If people just stay logged into all the time then they may not be contributing any load.

Yeah.

top - 20:16:55 up 10 days,  1:48, 129 users,  load average: 3.08, 2.69, 2.53
Tasks: 1254 total,   5 running, 1220 sleeping,  29 stopped,   0 zombie
Cpu(s): 17.0%us,  3.0%sy,  0.0%ni, 79.4%id,  0.3%wa,  0.0%hi,  0.2%si,  0.0%st
Mem:  65920824k total, 52860736k used, 13060088k free,  1740012k buffers
Swap:  4194296k total,        0k used,  4194296k free, 34749468k cached

> 
It's a 16-core beast, not much different from the compute nodes:

processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 45
model name      : Intel(R) Xeon(R) CPU E5-2680 0 @ 2.70GHz
stepping        : 7
cpu MHz         : 2699.953
cache size      : 20480 KB
physical id     : 0
siblings        : 8
core id         : 0
cpu cores       : 8
apicid          : 0
initial apicid  : 0
fpu             : yes
fpu_exception   : yes
cpuid level     : 13
wp              : yes



>  BTW: PETSc does a parallel compile (which is why it is so fast) did the sysadmin complain ?

No he didn't but I don't want to tempt him. I'll talk to him tomorrow.

Victor.