From 8dec35910330a44de3fa08573e3029f10b3aa4ae Mon Sep 17 00:00:00 2001 From: Sverker Eriksson Date: Thu, 7 Mar 2019 20:42:57 +0100 Subject: erts: Remove ets traversal yielding if heap fragment Many heap fragments do no longer make the GC slow. Even worse, we are not guaranteed that a yield will provoke a GC removing the fragments, which might lead to a one-yield-per-bucket scenario if the heap fragment(s) still remains after each yield. --- erts/emulator/beam/erl_bif_info.c | 11 ++++++++++- erts/emulator/beam/erl_db_hash.c | 12 ++---------- erts/emulator/beam/erl_db_tree.c | 14 -------------- 3 files changed, 12 insertions(+), 25 deletions(-) (limited to 'erts') diff --git a/erts/emulator/beam/erl_bif_info.c b/erts/emulator/beam/erl_bif_info.c index 4050fb6146..43d99db0b2 100644 --- a/erts/emulator/beam/erl_bif_info.c +++ b/erts/emulator/beam/erl_bif_info.c @@ -4459,7 +4459,16 @@ BIF_RETTYPE erts_debug_set_internal_state_2(BIF_ALIST_2) refbin)); } } - + else if (ERTS_IS_ATOM_STR("mbuf", BIF_ARG_1)) { + Uint sz = size_object(BIF_ARG_2); + ErlHeapFragment* frag = new_message_buffer(sz); + Eterm *hp = frag->mem; + Eterm copy = copy_struct(BIF_ARG_2, sz, &hp, &frag->off_heap); + frag->next = BIF_P->mbuf; + BIF_P->mbuf = frag; + BIF_P->mbuf_sz += sz; + BIF_RET(copy); + } } BIF_ERROR(BIF_P, BADARG); diff --git a/erts/emulator/beam/erl_db_hash.c b/erts/emulator/beam/erl_db_hash.c index cf928a9035..47d304f860 100644 --- a/erts/emulator/beam/erl_db_hash.c +++ b/erts/emulator/beam/erl_db_hash.c @@ -1328,11 +1328,7 @@ static int match_traverse(Process* p, DbTableHash* tb, unlock_hash_function(lck); break; } - if (iterations_left <= 0 || MBUF(p)) { - /* - * We have either reached our limit, or just created some heap fragments. - * Since many heap fragments will make the GC slower, trap and GC now. - */ + if (iterations_left <= 0) { unlock_hash_function(lck); ret_value = on_trap(context_ptr, slot_ix, got, &mpi.mp, ret); goto done; @@ -1451,11 +1447,7 @@ static int match_traverse_continue(Process* p, DbTableHash* tb, unlock_hash_function(lck); break; } - if (iterations_left <= 0 || MBUF(p)) { - /* - * We have either reached our limit, or just created some heap fragments. - * Since many heap fragments will make the GC slower, trap and GC now. - */ + if (iterations_left <= 0) { unlock_hash_function(lck); ret_value = on_trap(context_ptr, slot_ix, got, mpp, ret); goto done; diff --git a/erts/emulator/beam/erl_db_tree.c b/erts/emulator/beam/erl_db_tree.c index 7c80e92e50..f222ac45ae 100644 --- a/erts/emulator/beam/erl_db_tree.c +++ b/erts/emulator/beam/erl_db_tree.c @@ -3344,13 +3344,6 @@ static int doit_select(DbTableTree *tb, TreeDbTerm *this, void *ptr, if (is_value(ret)) { sc->accum = CONS(hp, ret, sc->accum); } - if (MBUF(sc->p)) { - /* - * Force a trap and GC if a heap fragment was created. Many heap fragments - * make the GC slow. - */ - sc->max = 0; - } if (--(sc->max) <= 0) { return 0; } @@ -3407,13 +3400,6 @@ static int doit_select_chunk(DbTableTree *tb, TreeDbTerm *this, void *ptr, ++(sc->got); sc->accum = CONS(hp, ret, sc->accum); } - if (MBUF(sc->p)) { - /* - * Force a trap and GC if a heap fragment was created. Many heap fragments - * make the GC slow. - */ - sc->max = 0; - } if (--(sc->max) <= 0 || sc->got == sc->chunk_size) { return 0; } -- cgit v1.2.3