Message-ID: <005401c061a8$a6d12be0$070210ac@horsell.ibgames.com> From: "Alan Lenton" Date: Sat, 9 Dec 2000 06:23:03 -0000 Subject: Re: [SLE] microsecond clock timer Hi, The C library provides a microsecond interval timer. However, the actual times it generates alarms are dependant on the granularity of the system timer, and in the man page it notes that the system timer currently only has a granularity of 10ms. I have the feeling that this is a limitation of PC architecture, but I wouldn't swear to it, because it's many years since I looked into it. In any case I suspect that you will have difficulty getting anything better than 10ms resolution. Try 'man setitimer' to look at the interval timer stuff. Regards, Alan Lenton <p>----- Original Message ----- From: "Garry Smith" To: Sent: Friday, December 08, 2000 10:53 PM Subject: [SLE] microsecond clock timer <p>> Hi all,

I am about to start doing some performance testing on a software project that I am involved with. I would like to use my version of SuSE Linux 7.0 Professional as one of the test platforms.

How can I get Linux to provide microsecond granularity when I make calls to the system clock? In otherwords, I need a microsecond clock on Linux to get accurate performance measurements of my software?

I have seen some information about this subject on the Net, but it seems to be focused on earlier versions of the Linux kernel.

On my machine, unama -a returns : Linux eclipse 2.2.16 #1 Wed Aug 2 20:22:26 GMT 2000 i686 unknown This is a uniprocessor machine, Intel Pentium III 450

Could you explain what I must do (and how) to achieve this functionality? Or does SuSE 7.0 already support the microsecond clock as standard?

Many thanks in advance for your kind help

regards Garry

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Message-ID: <3A36A859.5360154A@cfl.rr.com> Date: Tue, 12 Dec 2000 17:36:09 -0500 From: Mark Hounschell Subject: Re: [SLE] microsecond clock timer Garry Smith wrote:

Hi all,

I am about to start doing some performance testing on a software project that I am involved with. I would like to use my version of SuSE Linux 7.0 Professional as one of the test platforms.

How can I get Linux to provide microsecond granularity when I make calls to the system clock? In otherwords, I need a microsecond clock on Linux to get accurate performance measurements of my software?

I have seen some information about this subject on the Net, but it seems to be focused on earlier versions of the Linux kernel.

On my machine, unama -a returns : Linux eclipse 2.2.16 #1 Wed Aug 2 20:22:26 GMT 2000 i686 unknown This is a uniprocessor machine, Intel Pentium III 450

Could you explain what I must do (and how) to achieve this functionality? Or does SuSE 7.0 already support the microsecond clock as standard?

Many thanks in advance for your kind help

regards Garry

Not sure if you got my first attempt at sending this. I was in a hurry to get out of work. Take a look at this. It may be a little more than you need or are looking for but we are about to begin a port of most every thing you find on this site to linux/x86 arch. The rtom brd is a pci based card that already works on NT/x86. It's really just part of a larger effort to migrate legacy gould/encore hardware/software to unix/offtheself hardware. This propriatary legacy hardware/software is used mainly in the simulation(flight) market. REAL-TIME stuff. Most of what you'll find here is for the sole purpose of emulating the instruction set and hardware of these legacy machines used in the simulation market. Oh yea, it ain't cheap. http://www.encore.com/products/software/osenhanc/980058.shtml#hw -- Mark Hounschell dmarkh@cfl.rr.com