From 9338ea3f9d3f7db949001a461456e8ce0339a1b5 Mon Sep 17 00:00:00 2001 From: Sverker Eriksson Date: Fri, 18 May 2018 17:59:03 +0200 Subject: erts: Fix narrow race between ets:new and ets:delete of same named table. If other process does ets:delete before ets:new has completely finished and done save_owned_table then ets:delete might do delete_owned_table and deref wild pointers in tb->common.owned. --- erts/emulator/beam/erl_db.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/erts/emulator/beam/erl_db.c b/erts/emulator/beam/erl_db.c index 3a29f8cf56..c1eaaeee06 100644 --- a/erts/emulator/beam/erl_db.c +++ b/erts/emulator/beam/erl_db.c @@ -1776,9 +1776,11 @@ BIF_RETTYPE ets_new_2(BIF_ALIST_2) ret = make_tid(BIF_P, tb); save_sched_table(BIF_P, tb); + save_owned_table(BIF_P, tb); if (is_named && !insert_named_tab(BIF_ARG_1, tb, 0)) { tid_clear(BIF_P, tb); + delete_owned_table(BIF_P, tb); db_lock(tb,LCK_WRITE); free_heir_data(tb); @@ -1789,7 +1791,6 @@ BIF_RETTYPE ets_new_2(BIF_ALIST_2) } BIF_P->flags |= F_USING_DB; /* So we can remove tb if p dies */ - save_owned_table(BIF_P, tb); #ifdef HARDDEBUG erts_fprintf(stderr, -- cgit v1.2.3 From 1c8365272a55301609dc8c46aa49fa0ac048506e Mon Sep 17 00:00:00 2001 From: Sverker Eriksson Date: Fri, 18 May 2018 17:59:33 +0200 Subject: erts: Add system_info(ets_count) --- erts/doc/src/erlang.xml | 6 ++++++ erts/emulator/beam/erl_bif_info.c | 3 +++ erts/emulator/beam/erl_db.c | 26 +++++++++++++++++++------- erts/emulator/beam/erl_db.h | 3 ++- erts/emulator/test/system_info_SUITE.erl | 17 +++++++++++++++++ 5 files changed, 47 insertions(+), 8 deletions(-) diff --git a/erts/doc/src/erlang.xml b/erts/doc/src/erlang.xml index cff56b9cb8..5e0d30ebb7 100644 --- a/erts/doc/src/erlang.xml +++ b/erts/doc/src/erlang.xml @@ -8166,6 +8166,12 @@ ok erl(1).

+ + ets_count + +

Returns the number of ETS tables currently existing at the + local node.

+ ets_limit diff --git a/erts/emulator/beam/erl_bif_info.c b/erts/emulator/beam/erl_bif_info.c index 8b2b1a58c7..5789fa8e71 100644 --- a/erts/emulator/beam/erl_bif_info.c +++ b/erts/emulator/beam/erl_bif_info.c @@ -3129,6 +3129,9 @@ BIF_RETTYPE system_info_1(BIF_ALIST_1) else if (ERTS_IS_ATOM_STR("ets_limit",BIF_ARG_1)) { BIF_RET(make_small(erts_db_get_max_tabs())); } + else if (ERTS_IS_ATOM_STR("ets_count",BIF_ARG_1)) { + BIF_RET(make_small(erts_ets_table_count())); + } else if (ERTS_IS_ATOM_STR("atom_limit",BIF_ARG_1)) { BIF_RET(make_small(erts_get_atom_limit())); } diff --git a/erts/emulator/beam/erl_db.c b/erts/emulator/beam/erl_db.c index c1eaaeee06..c9ab75fc88 100644 --- a/erts/emulator/beam/erl_db.c +++ b/erts/emulator/beam/erl_db.c @@ -450,7 +450,7 @@ save_sched_table(Process *c_p, DbTable *tb) DbTable *first; ASSERT(esdp); - esdp->ets_tables.count++; + erts_atomic_inc_nob(&esdp->ets_tables.count); erts_refc_inc(&tb->common.refc, 1); first = esdp->ets_tables.clist; @@ -474,8 +474,8 @@ remove_sched_table(ErtsSchedulerData *esdp, DbTable *tb) ASSERT(erts_get_ref_numbers_thr_id(ERTS_MAGIC_BIN_REFN(tb->common.btid)) == (Uint32) esdp->no); - ASSERT(esdp->ets_tables.count > 0); - esdp->ets_tables.count--; + ASSERT(erts_atomic_read_nob(&esdp->ets_tables.count) > 0); + erts_atomic_dec_nob(&esdp->ets_tables.count); eaydp = ERTS_SCHED_AUX_YIELD_DATA(esdp, ets_all); if (eaydp->ongoing) { @@ -2446,7 +2446,7 @@ ets_all_reply(ErtsSchedulerData *esdp, ErtsEtsAllReq **reqpp, ASSERT(!*tablepp); /* Max heap size needed... */ - sz = esdp->ets_tables.count; + sz = erts_atomic_read_nob(&esdp->ets_tables.count); sz *= ERTS_MAGIC_REF_THING_SIZE + 2; sz += 3 + ERTS_REF_THING_SIZE; hfragp = new_message_buffer(sz); @@ -2530,7 +2530,8 @@ erts_handle_yielded_ets_all_request(ErtsSchedulerData *esdp, if (!eaydp->queue) return 0; /* All work completed! */ - if (yc < ERTS_ETS_ALL_TB_YCNT_START && yc > esdp->ets_tables.count) + if (yc < ERTS_ETS_ALL_TB_YCNT_START && + yc > erts_atomic_read_nob(&esdp->ets_tables.count)) return 1; /* Yield! */ eaydp->ongoing = ongoing = eaydp->queue; @@ -2609,7 +2610,6 @@ BIF_RETTYPE ets_internal_request_all_0(BIF_ALIST_0) BIF_RET(ref); } - /* ** db_slot(Db, Slot) -> [Items]. */ @@ -3539,7 +3539,7 @@ erts_ets_sched_spec_data_init(ErtsSchedulerData *esdp) eaydp->tab = NULL; eaydp->queue = NULL; esdp->ets_tables.clist = NULL; - esdp->ets_tables.count = 0; + erts_atomic_init_nob(&esdp->ets_tables.count, 0); } @@ -4347,6 +4347,18 @@ erts_db_get_max_tabs() return db_max_tabs; } +Uint erts_ets_table_count(void) +{ + Uint tb_count = 0; + Uint six; + + for (six = 0; six < erts_no_schedulers; six++) { + ErtsSchedulerData *esdp = &erts_aligned_scheduler_data[six].esd; + tb_count += erts_atomic_read_nob(&esdp->ets_tables.count); + } + return tb_count; +} + /* * For testing of meta tables only. * diff --git a/erts/emulator/beam/erl_db.h b/erts/emulator/beam/erl_db.h index db86c81914..1664db9a41 100644 --- a/erts/emulator/beam/erl_db.h +++ b/erts/emulator/beam/erl_db.h @@ -45,7 +45,7 @@ typedef struct { } ErtsEtsAllYieldData; typedef struct { - Uint count; + erts_atomic_t count; DbTable *clist; } ErtsEtsTables; @@ -69,6 +69,7 @@ typedef struct { /*TT*/ Uint erts_get_ets_misc_mem_size(void); +Uint erts_ets_table_count(void); typedef struct { DbTableCommon common; diff --git a/erts/emulator/test/system_info_SUITE.erl b/erts/emulator/test/system_info_SUITE.erl index fdf4aab24d..7309908337 100644 --- a/erts/emulator/test/system_info_SUITE.erl +++ b/erts/emulator/test/system_info_SUITE.erl @@ -37,6 +37,7 @@ -export([process_count/1, system_version/1, misc_smoke_tests/1, heap_size/1, wordsize/1, memory/1, ets_limit/1, atom_limit/1, + ets_count/1, atom_count/1]). suite() -> @@ -45,6 +46,7 @@ suite() -> all() -> [process_count, system_version, misc_smoke_tests, + ets_count, heap_size, wordsize, memory, ets_limit, atom_limit, atom_count]. %%% @@ -478,6 +480,21 @@ get_node_name(Config) -> ++ "-" ++ integer_to_list(erlang:unique_integer([positive]))). +ets_count(Config) when is_list(Config) -> + [ets_count_do([Type | Named]) + || Type <- [set, bag, duplicate_bag, ordered_set], + Named <- [[named_table], []] + ], + ok. + +ets_count_do(Opts) -> + Before = erlang:system_info(ets_count), + T = ets:new(?MODULE, Opts), + After = erlang:system_info(ets_count), + After = Before + 1, + ets:delete(T), + Before = erlang:system_info(ets_count). + %% Verify system_info(ets_limit) reflects max ETS table settings. ets_limit(Config0) when is_list(Config0) -> -- cgit v1.2.3 From 9611459cddf27fd648aad4d799ca1fc4cf92f351 Mon Sep 17 00:00:00 2001 From: Sverker Eriksson Date: Mon, 21 May 2018 13:52:47 +0200 Subject: erts: Refactor usage of am_atom_put to ERTS_MAKE_AM and let compiler determine string lengths. These were actually wrong in erl_db.c: count_trap\0 replace_tra select_tra --- erts/emulator/beam/erl_alloc.c | 32 +++++++++++++++----------------- erts/emulator/beam/erl_bif_chksum.c | 2 +- erts/emulator/beam/erl_db.c | 14 +++++++------- erts/emulator/beam/erl_db_util.c | 8 +++----- erts/emulator/beam/erl_unicode.c | 10 +++++----- erts/emulator/beam/utils.c | 7 +++---- erts/emulator/sys/common/erl_mmap.c | 4 ++-- 7 files changed, 36 insertions(+), 41 deletions(-) diff --git a/erts/emulator/beam/erl_alloc.c b/erts/emulator/beam/erl_alloc.c index d99d2ea57b..575d6ca867 100644 --- a/erts/emulator/beam/erl_alloc.c +++ b/erts/emulator/beam/erl_alloc.c @@ -2821,20 +2821,20 @@ erts_allocator_options(void *proc) Eterm as[4]; Eterm ts[4]; - as[l] = am_atom_put("e", 1); + as[l] = ERTS_MAKE_AM("e"); ts[l++] = am_true; switch (a) { case ERTS_ALC_A_SYSTEM: - as[l] = am_atom_put("m", 1); - ts[l++] = am_atom_put("libc", 4); + as[l] = ERTS_MAKE_AM("m"); + ts[l++] = ERTS_MAKE_AM("libc"); if(sas.trim_threshold >= 0) { - as[l] = am_atom_put("tt", 2); + as[l] = ERTS_MAKE_AM("tt"); ts[l++] = erts_bld_uint(hpp, szp, (Uint) sas.trim_threshold); } if(sas.top_pad >= 0) { - as[l] = am_atom_put("tp", 2); + as[l] = ERTS_MAKE_AM("tp"); ts[l++] = erts_bld_uint(hpp, szp, (Uint) sas.top_pad); } break; @@ -2848,7 +2848,7 @@ erts_allocator_options(void *proc) } else { - Eterm atom = am_atom_put("e", 1); + Eterm atom = ERTS_MAKE_AM("e"); Eterm term = am_false; tmp = erts_bld_2tup_list(hpp, szp, 1, &atom, &term); } @@ -2859,12 +2859,12 @@ erts_allocator_options(void *proc) #if HAVE_ERTS_MSEG if (use_mseg) { - atoms[length] = am_atom_put("mseg_alloc", 10); + atoms[length] = ERTS_MAKE_AM("mseg_alloc"); terms[length++] = erts_mseg_info_options(0, NULL, NULL, hpp, szp); } #endif - atoms[length] = am_atom_put("alloc_util", 10); + atoms[length] = ERTS_MAKE_AM("alloc_util"); terms[length++] = erts_alcu_au_info_options(NULL, NULL, hpp, szp); #if HAVE_ERTS_MMAP @@ -2874,17 +2874,15 @@ erts_allocator_options(void *proc) #endif { Eterm o[1], v[1]; - o[0] = am_atom_put("t", 1); + o[0] = ERTS_MAKE_AM("t"); v[0] = erts_mtrace_enabled ? am_true : am_false; - atoms[length] = am_atom_put("instr", 5); + atoms[length] = ERTS_MAKE_AM("instr"); terms[length++] = erts_bld_2tup_list(hpp, szp, 1, o, v); } - atoms[length] = am_atom_put("lock_physical_memory", 20); - terms[length++] = (lock_all_physical_memory - ? am_atom_put("all", 3) - : am_atom_put("no", 2)); + atoms[length] = ERTS_MAKE_AM("lock_physical_memory"); + terms[length++] = (lock_all_physical_memory ? am_all : am_no); settings = erts_bld_2tup_list(hpp, szp, length, atoms, terms); @@ -2899,10 +2897,10 @@ erts_allocator_options(void *proc) #if HAVE_ERTS_MSEG if (use_mseg) - terms[length++] = am_atom_put("mseg_alloc", 10); + terms[length++] = ERTS_MAKE_AM("mseg_alloc"); #endif #if ERTS_HAVE_ERTS_SYS_ALIGNED_ALLOC - terms[length++] = am_atom_put("sys_aligned_alloc", 17); + terms[length++] = ERTS_MAKE_AM("sys_aligned_alloc"); #endif #if defined(ARCH_64) && defined(ERTS_HAVE_OS_PHYSICAL_MEMORY_RESERVATION) terms[length++] = ERTS_MAKE_AM("literal_mmap"); @@ -2911,7 +2909,7 @@ erts_allocator_options(void *proc) #if defined(__GLIBC__) { - Eterm AM_glibc = am_atom_put("glibc", 5); + Eterm AM_glibc = ERTS_MAKE_AM("glibc"); Eterm version; version = erts_bld_cons(hpp, diff --git a/erts/emulator/beam/erl_bif_chksum.c b/erts/emulator/beam/erl_bif_chksum.c index 9095bcd380..cf92687595 100644 --- a/erts/emulator/beam/erl_bif_chksum.c +++ b/erts/emulator/beam/erl_bif_chksum.c @@ -44,7 +44,7 @@ void erts_init_bif_chksum(void) { /* Non visual BIF to trap to. */ erts_init_trap_export(&chksum_md5_2_exp, - am_erlang, am_atom_put("md5_trap",8), 2, + am_erlang, ERTS_MAKE_AM("md5_trap"), 2, &md5_2); } diff --git a/erts/emulator/beam/erl_db.c b/erts/emulator/beam/erl_db.c index c9ab75fc88..df5253fb0d 100644 --- a/erts/emulator/beam/erl_db.c +++ b/erts/emulator/beam/erl_db.c @@ -3506,27 +3506,27 @@ void init_db(ErtsDbSpinCount db_spin_count) /* Non visual BIF to trap to. */ erts_init_trap_export(&ets_select_delete_continue_exp, - am_ets, am_atom_put("delete_trap",11), 1, + am_ets, ERTS_MAKE_AM("delete_trap"), 1, &ets_select_delete_trap_1); /* Non visual BIF to trap to. */ erts_init_trap_export(&ets_select_count_continue_exp, - am_ets, am_atom_put("count_trap",11), 1, + am_ets, ERTS_MAKE_AM("count_trap"), 1, &ets_select_count_1); /* Non visual BIF to trap to. */ erts_init_trap_export(&ets_select_replace_continue_exp, - am_ets, am_atom_put("replace_trap",11), 1, + am_ets, ERTS_MAKE_AM("replace_trap"), 1, &ets_select_replace_1); /* Non visual BIF to trap to. */ erts_init_trap_export(&ets_select_continue_exp, - am_ets, am_atom_put("select_trap",11), 1, + am_ets, ERTS_MAKE_AM("select_trap"), 1, &ets_select_trap_1); /* Non visual BIF to trap to. */ erts_init_trap_export(&ets_delete_continue_exp, - am_ets, am_atom_put("delete_trap",11), 1, + am_ets, ERTS_MAKE_AM("delete_trap"), 1, &ets_delete_trap); } @@ -4155,7 +4155,7 @@ static Eterm table_info(Process* p, DbTable* tb, Eterm What) else if (What == am_data) { print_table(ERTS_PRINT_STDOUT, NULL, 1, tb); ret = am_true; - } else if (What == am_atom_put("fixed",5)) { + } else if (ERTS_IS_ATOM_STR("fixed",What)) { if (IS_FIXED(tb)) ret = am_true; else @@ -4207,7 +4207,7 @@ static Eterm table_info(Process* p, DbTable* tb, Eterm What) ret = am_false; } erts_mtx_unlock(&tb->common.fixlock); - } else if (What == am_atom_put("stats",5)) { + } else if (ERTS_IS_ATOM_STR("stats",What)) { if (IS_HASH_TABLE(tb->common.status)) { FloatDef f; DbHashStats stats; diff --git a/erts/emulator/beam/erl_db_util.c b/erts/emulator/beam/erl_db_util.c index 37d261d0df..f1d47326b4 100644 --- a/erts/emulator/beam/erl_db_util.c +++ b/erts/emulator/beam/erl_db_util.c @@ -2770,9 +2770,7 @@ Eterm db_format_dmc_err_info(Process *p, DMCErrInfo *ei) sys_strcpy(buff,tmp->error_string); sl = sys_strlen(buff); shp = HAlloc(p, sl * 2 + 5); - sev = (tmp->severity == dmcWarning) ? - am_atom_put("warning",7) : - am_error; + sev = (tmp->severity == dmcWarning) ? am_warning : am_error; tlist = buf_to_intlist(&shp, buff, sl, NIL); tpl = TUPLE2(shp, sev, tlist); shp += 3; @@ -5180,7 +5178,7 @@ BIF_RETTYPE match_spec_test_3(BIF_ALIST_3) { Eterm res; #ifdef DMC_DEBUG - if (BIF_ARG_3 == am_atom_put("dis",3)) { + if (BIF_ARG_3 == ERTS_MAKE_AM("dis")) { test_disassemble_next = 1; BIF_RET(am_true); } else @@ -5291,7 +5289,7 @@ static Eterm match_spec_test(Process *p, Eterm against, Eterm spec, int trace) erts_free(ERTS_ALC_T_DB_TMP, arr); } erts_bin_free(mps); - ret = TUPLE4(hp, am_atom_put("ok",2), res, flg, lint_res); + ret = TUPLE4(hp, am_ok, res, flg, lint_res); } return ret; } diff --git a/erts/emulator/beam/erl_unicode.c b/erts/emulator/beam/erl_unicode.c index 8673e029e6..d225916ac5 100644 --- a/erts/emulator/beam/erl_unicode.c +++ b/erts/emulator/beam/erl_unicode.c @@ -79,23 +79,23 @@ void erts_init_unicode(void) max_loop_limit = CONTEXT_REDS * LOOP_FACTOR; /* Non visual BIFs to trap to. */ erts_init_trap_export(&characters_to_utf8_trap_exp, - am_erlang, am_atom_put("characters_to_utf8_trap",23), 3, + am_erlang, ERTS_MAKE_AM("characters_to_utf8_trap"), 3, &characters_to_utf8_trap); erts_init_trap_export(&characters_to_list_trap_1_exp, - am_erlang, am_atom_put("characters_to_list_trap_1",25), 3, + am_erlang, ERTS_MAKE_AM("characters_to_list_trap_1"), 3, &characters_to_list_trap_1); erts_init_trap_export(&characters_to_list_trap_2_exp, - am_erlang, am_atom_put("characters_to_list_trap_2",25), 3, + am_erlang, ERTS_MAKE_AM("characters_to_list_trap_2"), 3, &characters_to_list_trap_2); erts_init_trap_export(&characters_to_list_trap_3_exp, - am_erlang, am_atom_put("characters_to_list_trap_3",25), 3, + am_erlang, ERTS_MAKE_AM("characters_to_list_trap_3"), 3, &characters_to_list_trap_3); erts_init_trap_export(&characters_to_list_trap_4_exp, - am_erlang, am_atom_put("characters_to_list_trap_4",25), 1, + am_erlang, ERTS_MAKE_AM("characters_to_list_trap_4"), 1, &characters_to_list_trap_4); c_to_b_int_trap_exportp = erts_export_put(am_unicode,am_characters_to_binary_int,2); diff --git a/erts/emulator/beam/utils.c b/erts/emulator/beam/utils.c index d74052d8b2..87709edc15 100644 --- a/erts/emulator/beam/utils.c +++ b/erts/emulator/beam/utils.c @@ -1972,8 +1972,7 @@ static void do_send_logger_message(Eterm gl, Eterm tag, Eterm format, Eterm args break; } - md = MAP2(hp, am_emulator, am_true, - am_atom_put("tag", 3), el_tag); + md = MAP2(hp, am_emulator, am_true, ERTS_MAKE_AM("tag"), el_tag); hp += MAP2_SZ; if (is_nil(gl) && is_non_value(pid)) { @@ -1994,14 +1993,14 @@ static void do_send_logger_message(Eterm gl, Eterm tag, Eterm format, Eterm args /* no gl */ md = MAP3(hp, am_error_logger, md, - am_atom_put("gl", 2), gl, + ERTS_MAKE_AM("gl"), gl, am_time, time); hp += MAP3_SZ; pid = NIL; } else { md = MAP4(hp, am_error_logger, md, - am_atom_put("gl", 2), gl, + ERTS_MAKE_AM("gl"), gl, am_pid, pid, am_time, time); hp += MAP4_SZ; diff --git a/erts/emulator/sys/common/erl_mmap.c b/erts/emulator/sys/common/erl_mmap.c index 5dadd8a5a6..145503bea7 100644 --- a/erts/emulator/sys/common/erl_mmap.c +++ b/erts/emulator/sys/common/erl_mmap.c @@ -2514,8 +2514,8 @@ Eterm erts_mmap_debug_info(Process* p) sizeof(values)/sizeof(*values), tags, values); - sa_list = TUPLE2(hp, am_atom_put("sa_free_segs",12), sa_list); hp+=3; - sua_list = TUPLE2(hp, am_atom_put("sua_free_segs",13), sua_list); hp+=3; + sa_list = TUPLE2(hp, ERTS_MAKE_AM("sa_free_segs"), sa_list); hp+=3; + sua_list = TUPLE2(hp, ERTS_MAKE_AM("sua_free_segs"), sua_list); hp+=3; list = CONS(hp, sua_list, list); hp+=2; list = CONS(hp, sa_list, list); hp+=2; -- cgit v1.2.3 From 99dfe4573a6e89eb93c5fcec523f2a76af61d859 Mon Sep 17 00:00:00 2001 From: Sverker Eriksson Date: Mon, 21 May 2018 13:53:58 +0200 Subject: erts: Rename one of delete_trap to select_delete_trap --- erts/emulator/beam/erl_db.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/erts/emulator/beam/erl_db.c b/erts/emulator/beam/erl_db.c index df5253fb0d..a91a8d7c2e 100644 --- a/erts/emulator/beam/erl_db.c +++ b/erts/emulator/beam/erl_db.c @@ -3506,7 +3506,7 @@ void init_db(ErtsDbSpinCount db_spin_count) /* Non visual BIF to trap to. */ erts_init_trap_export(&ets_select_delete_continue_exp, - am_ets, ERTS_MAKE_AM("delete_trap"), 1, + am_ets, ERTS_MAKE_AM("select_delete_trap"), 1, &ets_select_delete_trap_1); /* Non visual BIF to trap to. */ -- cgit v1.2.3 From 29946f8628df35f000e37e5db8782decfa44876b Mon Sep 17 00:00:00 2001 From: Sverker Eriksson Date: Mon, 21 May 2018 14:33:27 +0200 Subject: erts: Increase scalability of ets name lookup by expanding the default size of the hash table and increase number of locks. --- erts/emulator/beam/erl_db.c | 10 +++++++--- erts/emulator/beam/erl_db.h | 2 +- 2 files changed, 8 insertions(+), 4 deletions(-) diff --git a/erts/emulator/beam/erl_db.c b/erts/emulator/beam/erl_db.c index a91a8d7c2e..5bae1730e4 100644 --- a/erts/emulator/beam/erl_db.c +++ b/erts/emulator/beam/erl_db.c @@ -322,10 +322,10 @@ erts_db_make_tid(Process *c_p, DbTableCommon *tb) /* ** The meta hash table of all NAMED ets tables */ -# define META_NAME_TAB_LOCK_CNT 16 +# define META_NAME_TAB_LOCK_CNT 256 union { erts_rwmtx_t lck; - byte _cache_line_alignment[64]; + byte align[ERTS_ALC_CACHE_LINE_ALIGN_SIZE(sizeof(erts_rwmtx_t))]; }meta_name_tab_rwlocks[META_NAME_TAB_LOCK_CNT]; static struct meta_name_tab_entry { union { @@ -3491,7 +3491,11 @@ void init_db(ErtsDbSpinCount db_spin_count) db_max_tabs, ((Uint)1)< Date: Mon, 21 May 2018 15:24:53 +0200 Subject: erts: Reduce test log noise from ets_SUITE --- lib/stdlib/test/ets_SUITE.erl | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/lib/stdlib/test/ets_SUITE.erl b/lib/stdlib/test/ets_SUITE.erl index 574aac96c8..a97fe4a5d9 100644 --- a/lib/stdlib/test/ets_SUITE.erl +++ b/lib/stdlib/test/ets_SUITE.erl @@ -6209,20 +6209,23 @@ spawn_logger(Procs) -> ok; (Proc) -> Mon = erlang:monitor(process, Proc), - receive + ok = receive {'DOWN', Mon, _, _, _} -> ok after 0 -> case Kill of true -> exit(Proc, kill); - _ -> - erlang:display({"Waiting for 'DOWN' from", Proc, - process_info(Proc), - pid_status(Proc)}) + _ -> ok end, receive {'DOWN', Mon, _, _, _} -> ok + after 5000 -> + io:format("Waiting for 'DOWN' from ~w, status=~w\n" + "info = ~p\n", [Proc, + pid_status(Proc), + process_info(Proc)]), + timeout end end end, Procs), -- cgit v1.2.3 From b8631ef58c94507d876155ac92335fd9606b259f Mon Sep 17 00:00:00 2001 From: Sverker Eriksson Date: Mon, 21 May 2018 17:49:52 +0200 Subject: erts,stdlib: Improve docs about obsolete ets_limit --- erts/doc/src/erl.xml | 6 ++++-- erts/doc/src/erlang.xml | 10 +++------- lib/stdlib/doc/src/ets.xml | 6 ++++-- system/doc/efficiency_guide/advanced.xml | 5 ----- 4 files changed, 11 insertions(+), 16 deletions(-) diff --git a/erts/doc/src/erl.xml b/erts/doc/src/erl.xml index 74654a295d..4cf0066999 100644 --- a/erts/doc/src/erl.xml +++ b/erts/doc/src/erl.xml @@ -631,14 +631,16 @@ of process heaps is destroyed by the crash dump generation.

Option +d instructs the emulator to produce only a core dump and no crash dump if an internal error is detected.

-

Calling +

Calling erlang:halt/1 with a string argument still produces a crash dump. On Unix systems, sending an emulator process a SIGUSR1 signal also forces a crash dump.

 -

Sets the maximum number of ETS tables.

+

Sets the maximum number of ETS tables. This limit is + partially obsolete. +

diff --git a/erts/doc/src/erlang.xml b/erts/doc/src/erlang.xml index 5e0d30ebb7..b1fc4ec450 100644 --- a/erts/doc/src/erlang.xml +++ b/erts/doc/src/erlang.xml @@ -8175,13 +8175,9 @@ ok ets_limit -

Returns the maximum number of ETS tables allowed. This - limit can be increased at startup by passing - command-line flag - +e to - erl(1) or by setting environment variable - ERL_MAX_ETS_TABLES before starting the Erlang - runtime system.

+

Returns the limit for number of ETS tables. This limit is + partially obsolete + and number of tables are only limited by available memory.

 port_count diff --git a/lib/stdlib/doc/src/ets.xml b/lib/stdlib/doc/src/ets.xml index 305376a425..1995262145 100644 --- a/lib/stdlib/doc/src/ets.xml +++ b/lib/stdlib/doc/src/ets.xml @@ -49,14 +49,16 @@ associated with each key. A bag or duplicate_bag table can have many objects associated with each key.

+

The number of tables stored at one Erlang node used to be limited. This is no longer the case (except by memory usage). The previous default limit was about 1400 tables and could be increased by setting the environment variable - ERL_MAX_ETS_TABLES before starting the Erlang runtime - system. This hard limit has been removed, but it is currently + ERL_MAX_ETS_TABLES or the command line option + +e before starting the + Erlang runtime system. This hard limit has been removed, but it is currently useful to set the ERL_MAX_ETS_TABLES anyway. It should be set to an approximate of the maximum amount of tables used. This since an internal table for named tables is sized using this value. If diff --git a/system/doc/efficiency_guide/advanced.xml b/system/doc/efficiency_guide/advanced.xml index 21d4a66d77..b303fd47ed 100644 --- a/system/doc/efficiency_guide/advanced.xml +++ b/system/doc/efficiency_guide/advanced.xml @@ -187,11 +187,6 @@ By default, the maximum number of atoms is 1,048,576. This limit can be raised or lowered using the +t option. - - Ets tables - Default is 1400. It can be changed with the environment - variable ERL_MAX_ETS_TABLES. - Elements in a tuple The maximum number of elements in a tuple is 16,777,215 -- cgit v1.2.3