From: geraldo netto <[email protected]>
Committer: Nadav Har'El <[email protected]>
Branch: master
README: document -j option on make / scripts/build
Just in case, document -j option on make / scripts/build
Once someone might be unaware of this option
Also, document that nproc is a built-in command from bash/core-utils [1]
That counts the number of available processors
In my case, using compilation without -j takes ~5 minutes against 1.5
minutes with -j$(nproc)
Before, I used to overcommit the cpu/thread number on make / scripts/build
but the saturation can actually slow things down...
[1]
http://www.gnu.org/software/coreutils/manual/coreutils.html#nproc-invocation
Signed-off-by: geraldo netto <[email protected]>
Message-Id: <[email protected]>
---
diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -98,17 +98,26 @@ git submodule update --init --recursive
Finally, build everything at once:
```
-make
+make -j$(nproc)
```
to build only the OSv kernel, or more usefully,
```
-scripts/build
+scripts/build -j$(nproc)
```
to build an image of the OSv kernel and the default application.
+Command nproc (embedded in bash/core-utils) will calculte the number of
jobs/threads for make and scripts/build automatically.
+Alternatively, the environment variable MAKEFLAGS can be exported as
follows:
+
+```
+export MAKEFLAGS=-j$(nproc)
+```
+
+In that case, make and scripts/build do not need the parameter -j.
+
scripts/build creates the image ```build/last/usr.img``` in qcow2 format.
To convert this image to other formats, use the ```scripts/convert```
tool, which can create an image in the vmdk, vdi, raw, or qcow2-old formats
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