Giving more CPU time to a swapping process?
cswiger at mac.com
Thu Apr 6 13:53:39 UTC 2006
Karl Ma wrote:
> The process is so memory-hungry that it starts swap after the physical RAM
> max out. (To be exact, I've lowered the per-process limitation to make this
What did you lower, exactly? If you reduce the max resident datasize
needlessly, you're going to make your program swap more and run much slower.
> However, when I use top to monitor the status, the STATE of the process
> started to stay as "swread" for most of the time (instead of RUN before
> using swap) and its priority has dropped to -20; and the corresponding WCPU
> drops to around 1% only. And the CPU consumption time in total (for the
> whole job) would only increase a minute or two even the process has been
> running for more than a few hours.
Yes, because the task isn't using much CPU, it's entirely I/O bound.
> In Windows XP, which has less per-task resource restriction (I guess?), I
> did successfully complete the task on the same hardware machine; although it
> takes more than 30 mins.
> How can I push up the priority of the whole paging task? How can I
> allocate more CPU attention to this process? I've tried using "nice"
> but it does not help.
Won't help. Add more RAM, or adjust the program to be more clever about the
use of memory, possibly by using Numeric/numarray.
The size of your python process is surprising to me, python tends to run
relatively lightweight process sizes even when handling large data sets (ie,
> 1GB of data per day)...
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