Reading from a FIFO, burning CPU
tjreedy at udel.edu
Sun Jun 15 00:04:29 CEST 2003
"Elmar W. Hoefner" <elmar.hoefner at uibk.ac.at> wrote in message
news:bcg2m8$iqmme$1 at ID-113469.news.dfncis.de...
> Hi there!
> I tried to continuously stream a FIFO into my python script.
> I was successful so far, but the performance is not acceptable:
In a sense, the performance is too good. and that is why ...
> If I start the script, it eats 99% of my CPU cycles.
Like you told it to do. Unless you have some other work to interleave
with this process, this is no more wasteful than the CPU's or OS's own
> Can anyone give me a hint how to change this?
Simplest: try sleeping between readline() calls to free up CPU time
for other processes, or have your program go off and do something else
useful while waiting for more fifo data.
> I did it this way:
> fifo=open("/test_fifo", "r")
> while 1:
> # to stop the repeated printing of " '' " while nothing is
in the fifo:
> if line != '': print line
Terry J. Reedy
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