Re: Need to increase the processing speed?

are you asking about UNIX commands that can speed up processes? Try man nice and man renice

Note that this is not "improving your program's preformance but just a temporary hack to give your program a higher priority.

cheers

SK Update: going back to holli's point. If your code is not extermely complicated to post (length wise) then it would be better to for the monk's to look at it and then suggest some improvements. You mention 2GB file size. Is the program writing back to disk also or is it ready only? If you are writinig a lot of stuff and your system's IO is not that great try writing out compressed file. Also are you trying to read entire file in mem? etc. code will surely help!

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Re^2: Need to increase the processing speed? by jhourcle (Prior) on Jun 29, 2005 at 12:27 UTC
Unless your system is specially configured, under most situations 'nice' and 'renice' can only be used to slow down a process (make it behave more nicely, and give up its cycles). Root is the only user (or someone with root-like powers), who can increase the priority of a process to a level above its default value (in the scope of 'nice', giving it a lower 'nice' value). Unfortunately, most systems are set up so that everything runs at the highest priority -- so you have to renice everything else that is running, and can't just tweek the one program. (some multi-user systems are set up differently, but I don't know of any OSes that come set up this way out of the box). But of course, if you renice the wrong stuff, that's actually needed by the OS, you can have bad things happen. I'd say the way to go is hardware related ( faster disk, more memory, etc ), or reworking the program in question to deal with whatever the bottleneck is. If the system has been up for a while, a reboot before the process might help if anything leaked memory.	[reply]

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Re^2: Need to increase the processing speed?
by jhourcle (Prior) on Jun 29, 2005 at 12:27 UTC

Unless your system is specially configured, under most situations 'nice' and 'renice' can only be used to slow down a process (make it behave more nicely, and give up its cycles). Root is the only user (or someone with root-like powers), who can increase the priority of a process to a level above its default value (in the scope of 'nice', giving it a lower 'nice' value).

Unfortunately, most systems are set up so that everything runs at the highest priority -- so you have to renice everything else that is running, and can't just tweek the one program. (some multi-user systems are set up differently, but I don't know of any OSes that come set up this way out of the box). But of course, if you renice the wrong stuff, that's actually needed by the OS, you can have bad things happen.

I'd say the way to go is hardware related ( faster disk, more memory, etc ), or reworking the program in question to deal with whatever the bottleneck is. If the system has been up for a while, a reboot before the process might help if anything leaked memory.

[reply]