config/kernel.in
| author |
"Yann E. MORIN" <yann.morin.1998@anciens.enib.fr> |
|
Sun May 20 13:48:26 2007 +0000 (2007-05-20) |
| changeset 112 |
ea15433daba0 |
| parent 61 |
1207acb66003
|
| child 446 |
d205527c5e01 |
| permissions |
-rw-r--r-- |
Ah! I finally have a progress bar that doesn't stall the build!
- pipe size in Linux is only 8*512=4096 bytes
- pipe size is not setable
- when the feeding process spits out data faster than the eating
process can read it, then the feeding process stalls after 4KiB
of data sent to the pipe
- for us, the progress bar would spawn a sub-shell every line,
and the sub-shell would in turn spawn a 'date' command.
Which was sloooww as hell, and would cause some kind of a
starvation: the pipe was full most of the time, and the
feeding process was stalled all this time.
Now, we use internal variables and a little hack based onan offset
to determine the elapsed time. Much faster this way, but still
CPU-intensive.