Messages in this thread | | | From | Der Herr Hofrat <> | Subject | Re: Measure time | Date | Wed, 8 May 2002 14:00:36 +0200 (CEST) |
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> Hello! > > Is there any function for high precision time measuring. > time() returns only in second. I need nanoseconds. > you can directly read the TSC but that will not realy give you nanoseconds resolution as the actual read access even on a PIII/1GHz is going to take up to a few 100 nanoseconds, and depending on what you want to time stamp the overall jitter of that code can easaly be in the range of a microsecond.
There are some hard-realtime patches to the Linux kernel that will allow time precission of aprox. 1us (the TSC has a precission of 32ns) but I don't think you can get below that without dedicated hardware.
for RTLinux check at ftp://ftp.rtlinux.org/pub/rtlinux/
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