Re: [perfmon2] how to avoid/reduce variability in multiple experiments

2010-09-08 Thread stephane eranian
Hi, I suspect you are running on an Intel machine in which case I believe you could colect everything in one run. This is if the NMI watchdog is turned off. If you can turn it off then you have two generic counters for the cache events and a fixed counter for instructions_retired. That would help a

[perfmon2] how to avoid/reduce variability in multiple experiments

2010-09-06 Thread lulu he
Hi, I currently use pfmon to collect cache_miss_rate every 1M insns of parallel programs. Because my server only has 2 PMUs, so I have to run benchmark twice(once measure cache_references every 1M insns, twice cahce_misses every 1M insns) to get cache_miss_rate every 1M insns. I use the same inpu