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clean up options

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Daan 2022-02-02 19:01:41 -08:00
parent 932f866105
commit 4e65b5018f
4 changed files with 51 additions and 45 deletions
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5
doc/mimalloc-doc.h
View file

@ -811,9 +811,8 @@ typedef enum mi_option_e {
mi_option_segment_cache, ///< The number of segments per thread to keep cached.
mi_option_page_reset, ///< Reset page memory after \a mi_option_reset_delay milliseconds when it becomes free.
mi_option_segment_reset, ///< Experimental
mi_option_reset_delay, ///< Delay in milli-seconds before resetting a page (100ms by default)
mi_option_decommit_delay, ///< Delay in milli-seconds before decommitting currently unused reserved memory (25ms by default)
mi_option_use_numa_nodes, ///< Pretend there are at most N NUMA nodes
mi_option_reset_decommits, ///< Experimental
mi_option_eager_commit_delay, ///< Experimental
mi_option_os_tag, ///< OS tag to assign to mimalloc'd memory
_mi_option_last
@ -1068,7 +1067,7 @@ or via environment variables.
- `MIMALLOC_PAGE_RESET=0`: by default, mimalloc will reset (or purge) OS pages when not in use to signal to the OS
that the underlying physical memory can be reused. This can reduce memory fragmentation in long running (server)
programs. By setting it to `0` no such page resets will be done which can improve performance for programs that are not long
running. As an alternative, the `MIMALLOC_RESET_DELAY=`<msecs> can be set higher (100ms by default) to make the page
running. As an alternative, the `MIMALLOC_DECOMMIT_DELAY=`<msecs> can be set higher (100ms by default) to make the page
reset occur less frequently instead of turning it off completely.
- `MIMALLOC_LARGE_OS_PAGES=1`: use large OS pages (2MiB) when available; for some workloads this can significantly
improve performance. Use `MIMALLOC_VERBOSE` to check if the large OS pages are enabled -- usually one needs

19
include/mimalloc.h
View file

@ -306,27 +306,28 @@ typedef enum mi_option_e {
mi_option_show_errors,
mi_option_show_stats,
mi_option_verbose,
// the following options are experimental
// some of the following options are experimental
// (deprecated options are kept for binary backward compatibility with v1.x versions)
mi_option_eager_commit,
mi_option_eager_region_commit,
mi_option_reset_decommits,
mi_option_large_os_pages, // implies eager commit
mi_option_deprecated_eager_region_commit,
mi_option_deprecated_reset_decommits,
mi_option_large_os_pages, // implies eager commit
mi_option_reserve_huge_os_pages,
mi_option_reserve_huge_os_pages_at,
mi_option_reserve_os_memory,
mi_option_segment_cache,
mi_option_page_reset,
mi_option_abandoned_page_reset,
mi_option_segment_reset,
mi_option_abandoned_page_decommit,
mi_option_deprecated_segment_reset,
mi_option_eager_commit_delay,
mi_option_allow_decommit,
mi_option_reset_delay,
mi_option_segment_decommit_delay,
mi_option_decommit_delay,
mi_option_use_numa_nodes,
mi_option_limit_os_alloc,
mi_option_os_tag,
mi_option_max_errors,
mi_option_max_warnings,
mi_option_allow_decommit,
mi_option_segment_decommit_delay,
_mi_option_last
} mi_option_t;

56
src/options.c
View file

@ -49,54 +49,50 @@ typedef struct mi_option_desc_s {
mi_init_t init; // is it initialized yet? (from the environment)
mi_option_t option; // for debugging: the option index should match the option
const char* name; // option name without `mimalloc_` prefix
const char* legacy_name; // potential legacy v1.x option name
} mi_option_desc_t;
#define MI_OPTION(opt) mi_option_##opt, #opt
#define MI_OPTION_DESC(opt) {0, UNINIT, MI_OPTION(opt) }
#define MI_OPTION(opt) mi_option_##opt, #opt, NULL
#define MI_OPTION_LEGACY(opt,legacy) mi_option_##opt, #opt, #legacy
static mi_option_desc_t options[_mi_option_last] =
{
// stable options
#if MI_DEBUG || defined(MI_SHOW_ERRORS)
#if MI_DEBUG || defined(MI_SHOW_ERRORS)
{ 1, UNINIT, MI_OPTION(show_errors) },
#else
#else
{ 0, UNINIT, MI_OPTION(show_errors) },
#endif
#endif
{ 0, UNINIT, MI_OPTION(show_stats) },
{ 0, UNINIT, MI_OPTION(verbose) },
// the following options are experimental and not all combinations make sense.
// Some of the following options are experimental and not all combinations are valid. Use with care.
{ 1, UNINIT, MI_OPTION(eager_commit) }, // commit per segment directly (8MiB) (but see also `eager_commit_delay`)
#if defined(_WIN32) || (MI_INTPTR_SIZE <= 4) // and other OS's without overcommit?
{ 0, UNINIT, MI_OPTION(eager_region_commit) },
{ 0, UNINIT, MI_OPTION(reset_decommits) }, // reset decommits memory
#else
{ 1, UNINIT, MI_OPTION(eager_region_commit) },
{ 0, UNINIT, MI_OPTION(reset_decommits) }, // legacy; ignored now and reset always uses MADV_FREE/MADV_DONTNEED (issue #518)
#endif
{ 0, UNINIT, MI_OPTION(deprecated_eager_region_commit) },
{ 0, UNINIT, MI_OPTION(deprecated_reset_decommits) },
{ 0, UNINIT, MI_OPTION(large_os_pages) }, // use large OS pages, use only with eager commit to prevent fragmentation of VMA's
{ 0, UNINIT, MI_OPTION(reserve_huge_os_pages) }, // per 1GiB huge pages
{ -1, UNINIT, MI_OPTION(reserve_huge_os_pages_at) }, // reserve huge pages at node N
{ 0, UNINIT, MI_OPTION(reserve_os_memory) },
{ 0, UNINIT, MI_OPTION(segment_cache) }, // cache N segments per thread
{ 0, UNINIT, MI_OPTION(page_reset) }, // reset page memory on free
{ 0, UNINIT, MI_OPTION(abandoned_page_reset) },// reset free page memory when a thread terminates
{ 0, UNINIT, MI_OPTION(segment_reset) }, // reset segment memory on free (needs eager commit)
#if defined(__NetBSD__)
{ 0, UNINIT, MI_OPTION_LEGACY(abandoned_page_decommit, abandoned_page_reset) },// decommit free page memory when a thread terminates
{ 0, UNINIT, MI_OPTION(deprecated_segment_reset) },
#if defined(__NetBSD__)
{ 0, UNINIT, MI_OPTION(eager_commit_delay) }, // the first N segments per thread are not eagerly committed
#elif defined(_WIN32)
#elif defined(_WIN32)
{ 4, UNINIT, MI_OPTION(eager_commit_delay) }, // the first N segments per thread are not eagerly committed (but per page in the segment on demand)
#else
#else
{ 1, UNINIT, MI_OPTION(eager_commit_delay) }, // the first N segments per thread are not eagerly committed (but per page in the segment on demand)
#endif
{ 1, UNINIT, MI_OPTION(allow_decommit) }, // decommit slices when no longer used (after reset_delay milli-seconds)
{ 25, UNINIT, MI_OPTION(reset_delay) }, // page reset delay in milli-seconds (= decommit)
{ 500, UNINIT, MI_OPTION(segment_decommit_delay) },// decommit delay in milli-seconds for freed segments
#endif
{ 25, UNINIT, MI_OPTION_LEGACY(decommit_delay, reset_delay) }, // page decommit delay in milli-seconds
{ 0, UNINIT, MI_OPTION(use_numa_nodes) }, // 0 = use available numa nodes, otherwise use at most N nodes.
{ 0, UNINIT, MI_OPTION(limit_os_alloc) }, // 1 = do not use OS memory for allocation (but only reserved arenas)
{ 100, UNINIT, MI_OPTION(os_tag) }, // only apple specific for now but might serve more or less related purpose
{ 16, UNINIT, MI_OPTION(max_errors) }, // maximum errors that are output
{ 16, UNINIT, MI_OPTION(max_warnings) } // maximum warnings that are output
{ 16, UNINIT, MI_OPTION(max_warnings) }, // maximum warnings that are output
{ 1, UNINIT, MI_OPTION(allow_decommit) }, // decommit slices when no longer used (after decommit_delay milli-seconds)
{ 500, UNINIT, MI_OPTION(segment_decommit_delay) } // decommit delay in milli-seconds for freed segments
};
static void mi_option_init(mi_option_desc_t* desc);
@ -526,11 +522,21 @@ static bool mi_getenv(const char* name, char* result, size_t result_size) {
static void mi_option_init(mi_option_desc_t* desc) {
// Read option value from the environment
char s[64+1];
char buf[64+1];
mi_strlcpy(buf, "mimalloc_", sizeof(buf));
mi_strlcat(buf, desc->name, sizeof(buf));
char s[64+1];
if (mi_getenv(buf, s, sizeof(s))) {
bool found = mi_getenv(buf,s,sizeof(s));
if (!found && desc->legacy_name != NULL) {
mi_strlcpy(buf, "mimalloc_", sizeof(buf));
mi_strlcat(buf, desc->legacy_name, sizeof(buf));
found = mi_getenv(buf,s,sizeof(s));
if (found) {
_mi_warning_message("environment option \"mimalloc_%s\" is deprecated -- use \"mimalloc_%s\" instead.\n", desc->legacy_name, desc->name );
}
}
if (found) {
size_t len = strlen(s);
if (len >= sizeof(buf)) len = sizeof(buf) - 1;
for (size_t i = 0; i < len; i++) {

16
src/segment.c
View file

@ -538,7 +538,7 @@ static bool mi_segment_commitx(mi_segment_t* segment, bool commit, uint8_t* p, s
}
// increase expiration of reusing part of the delayed decommit
if (commit && mi_commit_mask_any_set(&segment->decommit_mask, &mask)) {
segment->decommit_expire = _mi_clock_now() + mi_option_get(mi_option_reset_delay);
segment->decommit_expire = _mi_clock_now() + mi_option_get(mi_option_decommit_delay);
}
// always undo delayed decommits
mi_commit_mask_clear(&segment->decommit_mask, &mask);
@ -554,7 +554,7 @@ static bool mi_segment_ensure_committed(mi_segment_t* segment, uint8_t* p, size_
static void mi_segment_perhaps_decommit(mi_segment_t* segment, uint8_t* p, size_t size, mi_stats_t* stats) {
if (!segment->allow_decommit) return;
if (mi_option_get(mi_option_reset_delay) == 0) {
if (mi_option_get(mi_option_decommit_delay) == 0) {
mi_segment_commitx(segment, false, p, size, stats);
}
else {
@ -569,21 +569,21 @@ static void mi_segment_perhaps_decommit(mi_segment_t* segment, uint8_t* p, size_
mi_commit_mask_t cmask;
mi_commit_mask_create_intersect(&segment->commit_mask, &mask, &cmask); // only decommit what is committed; span_free may try to decommit more
mi_commit_mask_set(&segment->decommit_mask, &cmask);
segment->decommit_expire = _mi_clock_now() + mi_option_get(mi_option_reset_delay);
segment->decommit_expire = _mi_clock_now() + mi_option_get(mi_option_decommit_delay);
mi_msecs_t now = _mi_clock_now();
if (segment->decommit_expire == 0) {
// no previous decommits, initialize now
mi_assert_internal(mi_commit_mask_is_empty(&segment->decommit_mask));
segment->decommit_expire = now + mi_option_get(mi_option_reset_delay);
segment->decommit_expire = now + mi_option_get(mi_option_decommit_delay);
}
else if (segment->decommit_expire <= now) {
// previous decommit mask already expired
// mi_segment_delayed_decommit(segment, true, stats);
segment->decommit_expire = now + (mi_option_get(mi_option_reset_delay) / 8); // wait a tiny bit longer in case there is a series of free's
segment->decommit_expire = now + (mi_option_get(mi_option_decommit_delay) / 8); // wait a tiny bit longer in case there is a series of free's
}
else {
// previous decommit mask is not yet expired
// segment->decommit_expire += 2; // = now + mi_option_get(mi_option_reset_delay);
// segment->decommit_expire += 2; // = now + mi_option_get(mi_option_decommit_delay);
}
}
}
@ -877,7 +877,7 @@ static mi_segment_t* mi_segment_init(mi_segment_t* segment, size_t required, mi_
segment->commit_mask = commit_mask; // on lazy commit, the initial part is always committed
segment->allow_decommit = (mi_option_is_enabled(mi_option_allow_decommit) && !segment->mem_is_pinned && !segment->mem_is_large);
if (segment->allow_decommit) {
segment->decommit_expire = _mi_clock_now() + mi_option_get(mi_option_reset_delay);
segment->decommit_expire = _mi_clock_now() + mi_option_get(mi_option_decommit_delay);
segment->decommit_mask = decommit_mask;
mi_assert_internal(mi_commit_mask_all_set(&segment->commit_mask, &segment->decommit_mask));
#if MI_DEBUG>2
@ -1245,7 +1245,7 @@ static void mi_segment_abandon(mi_segment_t* segment, mi_segments_tld_t* tld) {
}
// perform delayed decommits
mi_segment_delayed_decommit(segment, mi_option_is_enabled(mi_option_abandoned_page_reset) /* force? */, tld->stats);
mi_segment_delayed_decommit(segment, mi_option_is_enabled(mi_option_abandoned_page_decommit) /* force? */, tld->stats);
// all pages in the segment are abandoned; add it to the abandoned list
_mi_stat_increase(&tld->stats->segments_abandoned, 1);