I have a program that uses up a lot of CPU and want to make it is
efficient as possible with what I have to work with it. So which of the
following would be more efficient, knowing that l is a list and size is
a number?
l=l[:size]
del l[size:]
If it makes a difference, everything in the list is mutable.
May 18 '06
16  1686 
Dustan wrote: Obviously it takes a geek to know you have to time it, as opposed to
any other task you could be talking about.
wasn't the original question "my program uses a lot of CPU, and I want
to make it more efficient" ? what does "a lot of CPU" and "more
efficient" mean to you, and how do you know that your program uses "a
lot of CPU" ?
</F>
Fredrik Lundh wrote: Dustan wrote:
Obviously it takes a geek to know you have to time it, as opposed to
any other task you could be talking about.
wasn't the original question "my program uses a lot of CPU, and I want
to make it more efficient" ? what does "a lot of CPU" and "more
efficient" mean to you, and how do you know that your program uses "a
lot of CPU" ?
The task manager says "CPU Usage: 100%" when the program is running,
and only when the program is running.
Efficiency is a measure of 2 things: CPU usage and time. If you measure
just time, you're not necessarily getting the efficiency.
</F>
Dustan wrote: Fredrik Lundh wrote: Dustan wrote:
Obviously it takes a geek to know you have to time it, as opposed to
any other task you could be talking about.
wasn't the original question "my program uses a lot of CPU, and I want
to make it more efficient" ? what does "a lot of CPU" and "more
efficient" mean to you, and how do you know that your program uses "a
lot of CPU" ?
The task manager says "CPU Usage: 100%" when the program is running,
and only when the program is running.
Efficiency is a measure of 2 things: CPU usage and time. If you measure
just time, you're not necessarily getting the efficiency.
</F>
By the way, I've only been programming for a year or so (probably 18
months at the most). I'm sure that can't label me as a 'newbie', but at
least consider that before you criticize me like you did when I asked
about scientific notation.
"Dustan" <Du**********@g mail.com> wrote in
news:11******** **************@ u72g2000cwu.goo glegroups.com:
The task manager says "CPU Usage: 100%" when the program is
running, and only when the program is running.
Efficiency is a measure of 2 things: CPU usage and time. If you
measure just time, you're not necessarily getting the efficiency.
A lot of people, when they say 'uses a lot of CPU' are leaving off
'time'. I.e., CPU usage is pretty much talked about in terms of
cycles, which is roughly utilization*tim e. Profiling tools often
report both clock time and cpu time. Cpu time is a rough analog for
cycles, clock time is self explanatory.
max
Dustan wrote: The task manager says "CPU Usage: 100%" when the program is running,
and only when the program is running.
Efficiency is a measure of 2 things: CPU usage and time. If you measure
just time, you're not necessarily getting the efficiency.
are you for real?
</F>
Fredrik Lundh wrote: Dustan wrote:
The task manager says "CPU Usage: 100%" when the program is running,
and only when the program is running.
Efficiency is a measure of 2 things: CPU usage and time. If you measure
just time, you're not necessarily getting the efficiency.
are you for real?
And what exactly is that supposed to mean?
</F>
Dustan wrote: Fredrik Lundh wrote: are you for real?
And what exactly is that supposed to mean?
The obscurity in that communication is probably caused by the instance
of the effbot with which you have been corresponding having been
invoked with mildmannered=Tr ue -- apparently this is not the default
value for that arg and the constraints so imposed can lead to lack of
precision in the output :-)
HTH,
John This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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