On Tue, 13 Nov 2012 12:38:11 +0100 Juan Jose Garcia-Ripoll <juanjose.garciarip...@gmail.com> wrote:
> Dear Peter, > > I would appreciate if, instead of directing the questions to my private > email, you would send them to the mailing list for future use of other > people. This is not a private consulting office and if I answer some > question to you, it is most likely that I will have to answer the same > question again. > > On Tue, Nov 13, 2012 at 11:32 AM, Peter Enerccio <enerc...@gmail.com> wrote: > > > Okay, the only limitations that I somehow need is the memory allocation > > limit. Is that possible > > somehow in ecl? > > > > Please read > http://ecls.sourceforge.net/new-manual/ch28.html > They can be established, but it is hard to work with them for simple > reasons: when such an error happens, it is likely to affect other threads. > More precisely, the limits cannot be set on a per-thread basis and if one > thread triggers it, no other thread will be able to allocate more memory > and will also trigger an error. Indeed, to implement this you'd need a custom wrapper around the allocation functions (boehm for instance), or custom boehm-gc modifications. Still, anything used via FFI could potentially still allocate things in a way that would be difficult to control. In general, if you need to enforce permission, allocation and executon time limits, it would be better if you could use full processes (those may be chrooted, run under the wanted permissions, use setrlimit, and may be recycled-restarted regularily if they're allowed to serve more than one request (for performance reason to avoid constant fork and lisp context setup, restarting would allow to free leaked resources), and an RPC style system would be used to send requests and retreive results, possibly using s-exp, json, xml or a custom binary representation)... Of course the problem in this case becomes shared resources, especially ones which may be too large to easily pass as messages, if those are needed. A database could be used, files with advisory locks, and/or a custom system around mmap(2), sysvshm etc. -- Matt ------------------------------------------------------------------------------ Monitor your physical, virtual and cloud infrastructure from a single web console. Get in-depth insight into apps, servers, databases, vmware, SAP, cloud infrastructure, etc. Download 30-day Free Trial. Pricing starts from $795 for 25 servers or applications! http://p.sf.net/sfu/zoho_dev2dev_nov _______________________________________________ Ecls-list mailing list Ecls-list@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/ecls-list
