Hi, Thank you for that info. So that means if current stack > last stack, the stack pointer is C freed and malloced. If that's the case, then the behavior I've been experiencing is even more bizarre.
Also, you mentioned the built-in gc. What other GCs are available? Thanks, James On Tue, Aug 25, 2009 at 8:58 PM, Zoltan Varga <var...@gmail.com> wrote: > Hi, > > mono_gc_free_fixed () is a no-op when using mono's built in GC, since > mono_gc_alloc_fixed () is implemented as a call to GC_malloc (). > > Zoltan > > On Wed, Aug 26, 2009 at 2:55 AM, James Zhao <jameszha...@gmail.com> wrote: > >> Hi, >> Here's Mono Continuations' continuation_store (...). From looking at the >> code below, it appears as though store() follows these two branches: >> >> 1. cont->saved_stack && num_bytes <= cont->stack_alloc_size - use the >> memory directly >> >> 2. else - gc free the used memory, and create some new memory. >> However, the weird thing is if I repeatedly use continuation_store(), the >> memory usage increases until at a later step a huge and laggy GC operation >> is done. Can anyone explain why this happens? >> If I alloc/free a continuation for roughly each time I call store , the >> continuation appears to be GC'ed immediately. >> >> Thanks >> James >> static int continuation_store (MonoContinuation *cont, int state, >> MonoException **e) { MonoLMF *lmf = mono_get_lmf (); gsize num_bytes; if >> (!cont->domain) *e = mono_get_exception_argument ("cont", "Continuation not >> initialized"); if (cont->domain != mono_domain_get () || cont->thread_id != >> GetCurrentThreadId ()) *e = mono_get_exception_argument ("cont", >> "Continuation from another thread or domain"); cont->lmf = lmf; >> cont->return_ip = __builtin_return_address (0); cont->return_sp = >> __builtin_frame_address (0); num_bytes = (char*)cont->top_sp - >> (char*)cont->return_sp; /*g_print ("store: %d bytes, sp: %p, ip: %p, lmf: >> %p\n", num_bytes, cont->return_sp, cont->return_ip, lmf);*/ if >> (cont->saved_stack && num_bytes <= cont->stack_alloc_size) { /* clear to >> avoid GC retention */ if (num_bytes < cont->stack_used_size) memset >> ((char*)cont->saved_stack + num_bytes, 0, cont->stack_used_size - >> num_bytes); } else { tasklets_lock (); internal_init (); if >> (cont->saved_stack) { mono_g_hash_table_remove (keepalive_stacks, >> cont->saved_stack); mono_gc_free_fixed (cont->saved_stack); } >> cont->stack_used_size = num_bytes; cont->stack_alloc_size = num_bytes * 1.1; >> cont->saved_stack = mono_gc_alloc_fixed (cont->stack_alloc_size, NULL); >> mono_g_hash_table_insert (keepalive_stacks, cont->saved_stack, >> cont->saved_stack); tasklets_unlock (); } memcpy (cont->saved_stack, >> cont->return_sp, num_bytes); return state; } >> >> _______________________________________________ >> Mono-devel-list mailing list >> Mono-devel-list@lists.ximian.com >> http://lists.ximian.com/mailman/listinfo/mono-devel-list >> >> >
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