Re: luajit state CPU time limit
- From: Александр Киранов <xhaskx@xxxxxxxxx>
- To: luajit@xxxxxxxxxxxxx, jesus@xxxxxxxxxx
- Date: Wed, 5 Nov 2014 15:59:22 +0300
Thanks, Theo, I realized that there is nothing to do with already running
JITed code.
Other question: can I change luajit С source somewhere to force it to
produce JITed code with some custom function call every Nth operations? (N
= 1000, 1 000 000 or similar)
Or to check some pre-defined bool variable before each Nth operation?
---
С уважением,
Киранов Александр
2014-11-05 14:53 GMT+03:00 Theo Schlossnagle <jesus@xxxxxxxxxx>:
> The real challenge here is that if you "mess up" and get in an infinited
> JITted loop, there's nothing to be done about it.
>
> I think the only way to do this is by using setitimer() w/ ITIMER_PROF to
> interrupt the thread and deal with it within the signal handler. The bad
> part about this is that I haven't figured out how to get LuaJIT to unwind
> and cleanup cleanly.
>
> On Wed, Nov 5, 2014 at 12:47 PM, Александр Киранов <xhaskx@xxxxxxxxx>
> wrote:
>
>> Thanks everybody for proposals.
>>
>> Seems I found a solution - call lua_sethook() from different thread, if I
>> decided to terminate script execution (measured big CPU time consumption).
>> It's working in usual lua implementation.
>> But it's not working in luajit - hook is not called immediately after
>> lua_sethook() call in other thread, only at script end.
>> Example: http://pastebin.com/HdnfVQKB
>>
>> Main question is: is there other way to interrupt lua_State from other
>> thread? Consistency of interrupted lua_State is not necessary but
>> preferred, I only need return from luaL_dostring() in main thread with
>> non-zero result.
>>
>>
>>
>>
>> ---
>> С уважением,
>> Киранов Александр
>>
>> 2014-11-05 14:02 GMT+03:00 Victor Bombi <sonoro@xxxxxxxxxxxxxx>:
>>
>>> May be using luaLanes and lane priorities?
>>> I have not tested in linux but only on win32
>>>
>>> ----- Original Message -----
>>> *From:* Alexander Altshuler <altexy@xxxxxxxxx>
>>> *To:* luajit@xxxxxxxxxxxxx
>>> *Sent:* Wednesday, November 05, 2014 10:54 AM
>>> *Subject:* Re: luajit state CPU time limit
>>>
>>> On 4 November 2014 22:47, Javier Guerra Giraldez <javier@xxxxxxxxxxx>
>>> wrote:
>>>
>>>> On Tue, Nov 4, 2014 at 2:34 PM, Александр Киранов <xhaskx@xxxxxxxxx>
>>>> wrote:
>>>> > So, when some lua_State consumed too many CPU I need to know it and
>>>> handle
>>>> > it on LUA or on C level.
>>>>
>>>>
>>>> better handle it at the OS level. Linux includes many different tools
>>>> to limit resources. LXC and cgroups spring to mind. I would start
>>>> here: https://www.kernel.org/doc/Documentation/cgroups/cgroups.txt
>>>>
>>>>
>>> But you will have to decompose your application into some processes to
>>> get proper control granularity.
>>>
>>> Regards
>>> Alexander
>>>
>>>
>>
>
>
> --
>
> Theo Schlossnagle
>
> http://omniti.com/is/theo-schlossnagle
>
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