just to have your opinion

QNX Newsgroups (Archives) qdn.public.qnxrtp.os
1

Executing a program with absolutely nothing in the main() takes about 11
millisecondes on a P800 and 170 millisecondes on a P166.

I find these values very big, What’s your opinion?

Alain.

2

“Alain Bonnefoy” <alain.bonnefoy@icbt.com> wrote in message
news:3B728301.C7269338@icbt.com…

Executing a program with absolutely nothing in the main() takes about 11
millisecondes on a P800 and 170 millisecondes on a P166.

I find these values very big, What’s your opinion?

When a program is started lots is involved

  • Loading from Filesystem
  • Decoding ELF
  • Allocating memory and creating a new process
  • Binding to dll
  • opening std* (which sends message to devc-con)

Then when exiting

  • Unbinding dll
  • free memory (under QNX4 it was filled with 0 I assume it’s the same
    with QNX6)
  • Clean up process entry and returning all resource
  • Closing std*

That being said 170ms on a P166 sounds like a lot.

Alain.

3

Hi Alain,

Mario Charest <mcharest@zinformatic.com> wrote in article
<9ku1lf$98t$1@inn.qnx.com>…

When a program is started lots is involved

  • Loading from Filesystem
  • Decoding ELF
  • Allocating memory and creating a new process
  • Binding to dll
  • opening std* (which sends message to devc-con)

Then when exiting

  • Unbinding dll
  • free memory (under QNX4 it was filled with 0 I assume it’s the same
    with QNX6)
  • Clean up process entry and returning all resource
  • Closing std*

That being said 170ms on a P166 sounds like a lot.

Are the all processes above included in your measurement? How exactly do
you measure? Did you try debug/nodebug options during compiling of dummy
main?

Thanks,
Eduard.

4

Alain Bonnefoy <alain.bonnefoy@icbt.com> wrote:

Executing a program with absolutely nothing in the main() takes about 11
millisecondes on a P800 and 170 millisecondes on a P166.

I find these values very big, What’s your opinion?

Are you running this on a 6.x system running fs-pkg?

chris

\

cdm@qnx.com > “The faster I go, the behinder I get.”

Chris McKillop – Lewis Carroll –
Software Engineer, QSSL
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