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I have core i5 with 8gb RAM. I have VMware workstation 10.0.1 installed on my machine. I have fedora 20 Desktop Edition installed on VMware as guest OS. I am ...
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- 04-24-2014 #1
- Join Date
- Mar 2014
How to speed up linux kernel compilation?
I am working on linux kernel source code v 3.14.1. I am developing an I/O scheduler for linux kernel. After any modifications in code every time it takes around 1 hour and 30 minutes for compiling and installing the whole kernel code to see the changes.
Compilation and Installation commands:
So my question is it possible to reduce 1 hour and 30 minutes time into only 10 to 15 minutes?
Any help would be greatly appreciated!
- 04-25-2014 #2
That's way longer than most say a kernel compile takes. most says under hour, usually 10-30 minutes. Are you compiling in the VM then how is it configured, plus overhead of virtual storage. Other thing that I wonder is the make system working it should only be compiling the changed files, then relink. It's acting like something is "touching" the files forcing complete rebuild.A lion does not lose sleep, over the opinion of sheep.
- 04-30-2014 #3
- Join Date
- Apr 2009
- I can be found either 40 miles west of Chicago, in Chicago, or in a galaxy far, far away.
How many cores does your system have? My has 8, so I run make with the "-j 8" option which will turn a 2 hour compilation into 15 minutes! That option tells make how many threads to use to build sub-components. It isn't quite linear, but it is close! If my system is running a bunch of other tasks, then I will use "-j 4" and just use 4 cores to build the kernel modules, leaving plenty of CPU for other stuff.
And to docbop, my system without the "-j N" option will take about 2 hours to build a full RHEL kernel, and I have 8GB RAM, dual quad-core 3GHz Intel processors, and fast sata drives. I grant the system is 6+ years old, but it still keeps up with most newer systems.Sometimes, real fast is almost as good as real time.
Just remember, Semper Gumbi - always be flexible!
- 07-26-2014 #4
- Join Date
- Jul 2014
1. edit your .config file (via menuconfig for example) - remove all unused modules and kernel features.
2. make -j 9
3. don't compile modules and don't install the kernel(make install). use qemu to run the compiled kernel