Re: [PATCH 1/1] scripts/performance: Add dissect.py script

[Ahmed Karaman <ahmedkhaledkaraman@gmail.com>]

On Wed, Jul 1, 2020 at 3:41 PM Eric Blake <eblake@redhat.com> wrote:
>
> On 7/1/20 8:04 AM, Ahmed Karaman wrote:
> > Python script that dissects QEMU execution into three main phases:
> > code generation, JIT execution and helpers execution.
> >
> > Syntax:
> > dissect.py [-h] -- <qemu executable> [<qemu executable options>] \
> >                   <target executable> [<target executable options>]
> >
> > [-h] - Print the script arguments help message.
> >
> > Example of usage:
> > dissect.py -- qemu-arm coulomb_double-arm
>
> Given the example usage...
>
> >
> > Example output:
> > Total Instructions:        4,702,865,362
> >
> > Code Generation:             115,819,309       2.463%
> > JIT Execution:             1,081,980,528      23.007%
> > Helpers:                   3,505,065,525      74.530%
> >
> > Signed-off-by: Ahmed Karaman <ahmedkhaledkaraman@gmail.com>
> > ---
> >   scripts/performance/dissect.py | 165 +++++++++++++++++++++++++++++++++
> >   1 file changed, 165 insertions(+)
> >   create mode 100644 scripts/performance/dissect.py
> >
> > diff --git a/scripts/performance/dissect.py b/scripts/performance/dissect.py
> > new file mode 100644
>
> ...this should have the executable bit set.
Thanks Mr. Eric, I don't know why I always forget doing this before
sending the patch. Will do it in V2.
>
>
> > +def get_JIT_line(callgrind_data):
> > +    """
> > +    Search for the first instance of the JIT call in
> > +    the callgrind_annoutate output when ran using --tree=caller
>
> annotate
Thanks.

>
> > +    This is equivalent to the self number of instructions of JIT.
> > +
> > +    Parameters:
> > +    callgrind_data (list): callgrind_annotate output
> > +
> > +    Returns:
> > +    (int): Line number
> > +   """
> > +    line = -1
> > +    for i in range(len(callgrind_data)):
> > +        if callgrind_data[i].strip('\n') and \
> > +                callgrind_data[i].split()[-1] == "[???]":
> > +            line = i
> > +            break
> > +    if line == -1:
> > +        sys.exit("Couldn't locate the JIT call ... Exiting!")
>
> We tend to avoid ! at the end of error messages (it can come across as
> shouting at the user).
Yeah right, Will remove the exclamations.
>
> > +    return line
> > +
> > +
> > +def main():
> > +    # Parse the command line arguments
> > +    parser = argparse.ArgumentParser(
> > +        usage='dissect.py [-h] -- '
> > +        '<qemu executable> [<qemu executable options>] '
> > +        '<target executable> [<target executable options>]')
> > +
> > +    parser.add_argument('command', type=str, nargs='+', help=argparse.SUPPRESS)
> > +
> > +    args = parser.parse_args()
> > +
> > +    # Extract the needed variables from the args
> > +    command = args.command
> > +
> > +    # Insure that valgrind is installed
> > +    check_valgrind = subprocess.run(
> > +        ["which", "valgrind"], stdout=subprocess.DEVNULL)
> > +    if check_valgrind.returncode:
> > +        sys.exit("Please install valgrind before running the script!")
>
> and again
Noted.
>
> --
> Eric Blake, Principal Software Engineer
> Red Hat, Inc.           +1-919-301-3226
> Virtualization:  qemu.org | libvirt.org
>
Thanks for your feedback Mr. Eric.

Best regards,
Ahmed Karaman