10-30-2017
Below is what I traced back. Basically there will be huge file we are processing that in parallel . The file
transaction_data.dat will be compared with the
spend.dat. The file spend is a small file. We will match the transaction between these file and do the aggregation
I made the
transaction_data.dat in SAN . Even with that I am seeing the first parallel process is taking less time and the process time increase with the split going on
Below is the log on the process. I see the process split the file almost into equal split but not sure why the process different between each parallel run
Quote:
Process 1:
(21899) Total process time = 102.550
(21899) Final Elapsed time = 103.000
(21899) Position Start 0Position End 4700904
Process2:
(21900) Total process time = 193.660
(21900) Final Elapsed time = 195.000
(21900) Position Start 4700904Position End 9401808
Process 3:
(21901) Total process time = 300.220
(21901) Final Elapsed time = 303.000
(21901) Position Start 9401808Position End 14102218
Process 4:
(21902) Total process time = 333.180
(21902) Final Elapsed time = 337.000
(21902) Position Start 14102218Position End 18802628
Process 5:
(21903) Total process time = 379.340
(21903) Final Elapsed time = 383.000
(21903) Position Start 18802628Position End 23504026
Process 6:
(21904) Total process time = 423.610
(21904) Final Elapsed time = 428.000
(21904) Position Start 23504026Position End 28204436
Process 7:
(21905) Total process time = 411.130
(21905) Final Elapsed time = 415.000
(21905) Position Start 28204436Position End 32905093
Process 8:
(21906) Total process time = 532.900
(21906) Final Elapsed time = 538.000
Last edited by arunkumar_mca; 10-31-2017 at 12:03 PM..
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clock(3) Library Functions Manual clock(3)
NAME
clock - Reports CPU time used
LIBRARY
Standard C Library (libc.so, libc.a)
SYNOPSIS
#include <time.h>
clock_t clock (void);
STANDARDS
Interfaces documented on this reference page conform to industry standards as follows:
clock(): XPG4, XPG4-UNIX
Refer to the standards(5) reference page for more information about industry standards and associated tags.
DESCRIPTION
The clock() function reports the amount of processor time used by the calling process and each of its terminated child processes for which
a wait function has been executed. When a child process does not wait for its children, its child-process times are not included in its
times.
RETURN VALUES
The clock() function returns the amount of processor time (in microseconds) used since the first call to clock(). To convert the time to
seconds, divide it by CLOCKS_PER_SEC (which is defined to be 1,000,000 in <time.h>). If the processor time used is not available or its
value cannot be represented, the clock() function returns (clock_t)-1.
RELATED INFORMATION
Functions: ctime(3), getrusage(2), times(3), wait(2)
Standards: standards(5) delim off
clock(3)