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Special Forums UNIX and Linux Applications High Performance Computing IBM Hardware: Test speed of an execution core reliably. Post 302852907 by Corona688 on Thursday 12th of September 2013 03:12:05 PM
Old 09-12-2013
Multithreading does not work that way; two cores can't cooperate to run a single-threaded program faster. Single-threaded programs will run slower on machines with lots of slower cores; we've had some puzzled folks ask us why their new machines have worse single-threaded benchmarks than their old ones.

But more cores means you can run more threads or processes at once without sharing time; more total work can be accomplished in the aggregate; but a program has to be designed with this in mind (or multiple instances of it run) to take advantage of this capability.
 

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GCORE(1)						      General Commands Manual							  GCORE(1)

NAME
gcore - get core image of running process SYNOPSIS
gcore [-s][-c core] pid DESCRIPTION
gcore creates a core image of each specified process, suitable for use with adb(1). By default the core image is written to the file <pid>.core. The options are: -c Write the core file to the specified file instead of <pid>.core. -s Stop the process while creating the core image and resume it when done. This makes sure that the core dump will be in a consistent state. The process is resumed even if it was already stopped. Of course, you can obtain the same result by manually stopping the process with kill(1). The core image name was changed from core.<pid> to <pid>.core to prevent matching names like core.h and core.c when using programs such as find(1). FILES
<process-id>.core The core image. BUGS
If gcore encounters an error while creating the core image and the -s option was used the process will remain stopped. Swapped out processes and system processes (the swapper) may not be gcore'd. 4.2 Berkeley Distribution April 15, 1994 GCORE(1)
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