Inspecting a Live ruby process

Once it happened to me, a ruby application which i wrote took 100% CPU (sometimes) and it hangs the other processes too. Now i need to figure out, where ?. Since it happens once in a while, i could not able to simulate it. Then i search for "inspecting a live ruby process", and i got a very wonderful,useful article

Inspecting Live Ruby Process

To make it easier, u can save the following few lines of code, to a file (say gdb_inspect.sh)

set $ary = (int)backtrace(-1)
set $count = *($ary+8)
set $index = 0
while $index < $count
    x/1s *((int)rb_ary_entry($ary, $index)+12)
    set $index = $index + 1
end
now start the gdb, 

$gdb ruby <pid>

which starts a gdb session,

(gdb) source path/to/gdb_inspect.sh
.
.This shows currently, where the control resides.
.
(gdb)

In addition to this,Its also possible to inspect the value of a variable,
which is also explained in that article. After running the same 2-3 times with the pid of my ruby app.
i figured out the problem.

Comments

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