Re: [rtl] the performance of linux run on MPC860
Does not a lower time mean it runs faster? It sounds like linux is running faster than pSOS and VxWorks. Maybe I am mistaken by your test, but it sounds like Linux is faster. - Kal. shaolin zhang wrote: Part 1.1Type: Plain Text (text/plain) Encoding: base64 -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl Your_email" | mail [EMAIL PROTECTED] --- For more information on Real-Time Linux see: http://www.rtlinux.org/rtlinux/
Re: [rtl] the performance of linux run on MPC860
On Wed, Mar 29, 2000 at 01:57:30PM -0700, Kulwinder Atwal wrote: Does not a lower time mean it runs faster? It sounds like linux is running faster than pSOS and VxWorks. Maybe I am mistaken by your test, but it sounds like Linux is faster. - Kal. Without knowing full details of the source code, it is impossible to tell what might be happening. There's no description about what happens inside the loop, what compilers are used, etc. It could simply be a matter of one compiler inserting an extra memory operation, in order to be more correct or to make debugging easier. dave... -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl Your_email" | mail [EMAIL PROTECTED] --- For more information on Real-Time Linux see: http://www.rtlinux.org/rtlinux/
Re: [rtl] the performance of linux run on MPC860
Kulwinder Atwal wrote: shaolin zhang wrote: some result is: Linux pSOS VxWorks for(;;) for local variable: 0.52 usec/times 23.81 usec/times 4.79 usec/times for(;;) for global variable: 0.48 usec/times 9.58 usec/times 3.99 usec/times while() for local variable: 0.57 usec/times 11.90 usec/times 5.78 usec/times while() for global variable: 0.445 usec/times 11.90 usec/times 3.97 usec/times Does not a lower time mean it runs faster? It sounds like linux is running faster than pSOS and VxWorks. At least, it is rather unclear what the meassured values want to say anyway: how do you messure the execution time of an endless loop? :-) Do you think this "Empty-Loop-Benchmarks" say anything usefull for a more complex application? I doupt, your main application is an endless loop without content (maybe, you posted the whole stuff in the linuxppc-mailinglist, but definitly not at the RTL-Mailinglist) BTW: RTLinux will not speed up the execution time of loops. This only depends on the compiler. RTLinux just reduces latenciesjitters and gives you guaranteed response times. Please, can you be a little more specific and tell us exactly how you did you performace tests including the code? Bernhard -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl Your_email" | mail [EMAIL PROTECTED] --- For more information on Real-Time Linux see: http://www.rtlinux.org/rtlinux/
Re: [rtl] the performance of linux run on MPC860
In message [EMAIL PROTECTED] you wrote: Without knowing full details of the source code, it is impossible to tell what might be happening. There's no description about what happens inside the loop, what compilers are used, etc. It It's also interesting to know if caches are enabled, etc. Wolfgang -- Software Engineering: Embedded and Realtime Systems, Embedded Linux Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: [EMAIL PROTECTED] For every complex problem, there is a solution that is simple, neat, and wrong. -- H. L. Mencken -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl Your_email" | mail [EMAIL PROTECTED] --- For more information on Real-Time Linux see: http://www.rtlinux.org/rtlinux/
