Not only mruby, it is one of the difficult things to adjust the performance vs. memory efficiency of the software.
If the approximate target device is divided and the adjustment value for it is prepared by default, it is a good indicator to do fine adjustment.
This PR divides into four profiles.
***Caution: There is no basis for the definitions in the patch.***
- `MRB_CONSTRAINED_BASELINE_PROFILE` - for microprocessors. Reduce memory consumption.
- `MRB_BASELINE_PROFILE` - Default value of mruby.
- `MRB_MAIN_PROFILE` - For desktop computers. Assume that a huge amount of RAM, 10 MiB or more, is on board.
- `MRB_HIGH_PROFILE` - for servers. Assume that mruby VM has a long life.
As you can see the profile name has been ~~stolen~~ imitated from H.264.
If $rake_root_fiber is used, sh runs command in another Fiber. If
command is ran in another Fiber, "rescue RuntimEerror" can't rescue
exception for system(...) failure.
How to reproduce:
$ CC="gcc -std=gnu99" ./minirake
(in /home/kou/work/ruby/mruby.kou)
CC mrbgems/mruby-compiler/core/codegen.c -> build/test/mrbgems/mruby-compiler/core/codegen.o
sh: 1: gcc -std=gnu99: not found
rake aborted!
Command Failed: ["gcc -std=gnu99" -g -std=gnu99 ...]
It used heap allocated memory for the parser stack, but there's
possibility of parser termination by exceptions. In that case, the
parser stack memory is leaked.
We were afraid of stack consumption, but parser stack size is only 4KB,
so we don't have to worry about it (at least for the parser).
For the following reasons:
- Ruby compatibility.
- Add UTC offset (time zone informations was not included by #4433).
- More readable.
Example:
Before this patch:
p Time.gm(2003,4,5,6,7,8,9) #=> Sat Apr 5 06:07:08 2003
p Time.local(2013,10,28,16,27,48) #=> Mon Oct 28 16:27:48 2013
After this patch:
p Time.gm(2003,4,5,6,7,8,9) #=> 2003-04-05 06:07:08 UTC
p Time.local(2013,10,28,16,27,48) #=> 2013-10-28 16:27:48 +0900
Implementation:
I use `strftime(3)` because UTC offset can be added and program size become
smaller than the other implementations (using `sprintf(3)`, self conversion
etc) in my environment.
- A leading charactor for day is space.
- Time zone does not included.
Before this patch:
Time.gm(1982,3,4,5,6,7).asctime #=> "Thu Mar 04 05:06:07 UTC 1982"
After this patch:
Time.gm(1982,3,4,5,6,7).asctime #=> "Thu Mar 4 05:06:07 1982"
dearblue