PHP. How is execution time calculated?

As, unfortunately, I am rather good at programming infinite
loops, I have set
the maximum execution time on the test version of my program
to one second.
However it usually seems to take anything up to about a
minute to time out,
after which it announces that the maximum execution time of
one second has been
exceeded.
Why is there such a large discrepancy?
Clancy

.oO(Clancy)
>As, unfortunately, I am rather good at programming
infinite loops, I have set
>the maximum execution time on the test version of my
program to one second.
>However it usually seems to take anything up to about a
minute to time out,
>after which it announces that the maximum execution time
of one second has been
>exceeded.
>
>Why is there such a large discrepancy?
The set_time_limit directive doesn't set the "real" clock
time after
which the script will be killed. It's a bit more complicated
and there
are some more things to consider.
It depends on what the script is actually doing, because many
kinds of
operations like IO stuff, database operations, system calls
etc. do not
count to the execution time. If the script is just sleeping
and idling
around, it won't eat up any CPU time, so it might run a lot
longer than
just the time defined with set_time_limit.
In other cases the web server can be an issue as well,
especially when
you use a script to send large files to the browser. The
download might
take much more time than the PHP script is allowed to run,
because the
script delivers its content to the web server, which will
cache it on
its own before its delivered to the browser. And then the
script can be
finished already, while the download is still running.
So there are many things that have to be taken into account
when it
comes to determine the real script execution time.
Micha

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    user13019948 wrote:
    Hi,
    I have a tkprof file. How can I get the total execution time.
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    SQLTools++ for Oracle:
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            name1 type name1,
            prctr type prctr,
            tbal type dmbtr,
            bala type dmbtr,
            balb type dmbtr,
            balc type dmbtr,
            bald type dmbtr,
            bale type dmbtr,
            gbal type dmbtr,
        end of tt_bs.
    ************WORK AREA DECLARATION *********************
    data :  gs_bsik type tt_bsik,
            gs_bsak type tt_bsik,
            gs_lfb1 type tt_lfb1,
            gs_lfa1 type tt_lfa1,
            gs_ageing  type tt_ageing,
            gs_bs type tt_bs,
            gs_opdisp type tt_bs,
            gs_final type tt_bsik,
            gs_opbal type tt_opbal,
            gs_opfinal type tt_opbal.
    ************INTERNAL TABLE DECLARATION*************
    data :  gt_bsik type standard table of tt_bsik,
            gt_bsak type standard table of tt_bsik,
            gt_lfb1 type standard table of tt_lfb1,
            gt_lfa1 type standard table of tt_lfa1,
            gt_ageing type standard table of tt_ageing,
            gt_bs type standard table of tt_bs,
            gt_opdisp type standard table of tt_bs,
            gt_final type standard table of tt_bsik,
            gt_opbal type standard table of tt_opbal,
            gt_opfinal type standard table of tt_opbal.
    ALV DECLARATIONS *******************
    data : gs_fcat type slis_fieldcat_alv ,
           gt_fcat type slis_t_fieldcat_alv ,
           gs_sort type slis_sortinfo_alv,
           gs_fcats type slis_fieldcat_alv ,
           gt_fcats type slis_t_fieldcat_alv.
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    data :   kb type dmbtr ,
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              balancespgli like  bapi3008-bal_sglind,
              noteditems like  bapi3008-ntditms_rq,
              keybalance type table of  bapi3008_3 with header line,
             opbalance type p.
    SELECTION SCREEN DECLARATIONS *********************
    selection-screen begin of block b1 with frame .
    select-options : so_bukrs for bsik-bukrs obligatory,
                     so_lifnr for bsik-lifnr,
                     so_hkont for bsik-hkont,
                     so_prctr for bsik-prctr ,
                     so_mindk for lfb1-mindk,
                     so_ktokk for lfa1-ktokk.
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    selection-screen : begin of block b1 with frame.
    parameters       : p_rb1 radiobutton group rad1 .
    select-options   : so_date for sy-datum .
    selection-screen : end of block b1.
    ********************************ASSIGNING ALV GRID
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    gs_fcats-col_pos = 1.
    gs_fcats-fieldname = 'BUKRS'.
    gs_fcats-seltext_m =  text-001.
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    gs_fcats-col_pos = 2 .
    gs_fcats-fieldname = 'LIFNR'.
    gs_fcats-seltext_m = text-002.
    append gs_fcats to gt_fcats .
    gs_fcats-col_pos = 3.
    gs_fcats-fieldname = 'NAME1'.
    gs_fcats-seltext_m =  text-003.
    append gs_fcats to gt_fcats .
    gs_fcats-col_pos = 4.
    gs_fcats-fieldname = 'BALC'.
    gs_fcats-seltext_m =  text-016.
    append gs_fcats to gt_fcats .
    gs_fcats-col_pos = 5.
    gs_fcats-fieldname = 'BALA'.
    gs_fcats-seltext_m =  text-012.
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    gs_fcats-col_pos = 6.
    gs_fcats-fieldname = 'BALB'.
    gs_fcats-seltext_m =  text-013.
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    gs_fcats-col_pos = 7.
    gs_fcats-fieldname = 'TBAL'.
    gs_fcats-seltext_m =  text-014.
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    gs_fcats-col_pos = 8.
    gs_fcats-fieldname = 'GBAL'.
    gs_fcats-seltext_m =  text-015.
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    INITIALIZATION EVENTS ******************************
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    clear gs_bsik.
    Refreshing the internal tables.
    refresh gt_bsik.
    ******************START OF  SELECTION EVENTS **************************
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    -->  p1        text
    <--  p2        text
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       noteditems          = ' '
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      I_CALLBACK_HTML_TOP_OF_PAGE       = ' '
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