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75 lines
3.4 KiB
C
75 lines
3.4 KiB
C
#pragma once
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#include "iobuf.h"
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// Macros to record timestamped events that happens with a connection.
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// They are saved into a c->prof IO buffer, each event is a name and a 32-bit
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// timestamp in milliseconds since connection init time.
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//
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// Test (run in two separate terminals):
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// make -C examples/http-server/ CFLAGS_EXTRA=-DMG_ENABLE_PROFILE=1
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// curl localhost:8000
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// Output:
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// 1ea1f1e7 2 net.c:150:mg_close_conn 3 profile:
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// 1ea1f1e8 2 net.c:150:mg_close_conn 1ea1f1e6 init
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// 1ea1f1e8 2 net.c:150:mg_close_conn 0 EV_OPEN
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// 1ea1f1e8 2 net.c:150:mg_close_conn 0 EV_ACCEPT
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// 1ea1f1e8 2 net.c:150:mg_close_conn 0 EV_READ
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// 1ea1f1e8 2 net.c:150:mg_close_conn 0 EV_HTTP_MSG
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// 1ea1f1e8 2 net.c:150:mg_close_conn 0 EV_WRITE
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// 1ea1f1e8 2 net.c:150:mg_close_conn 1 EV_CLOSE
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//
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// Usage:
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// Enable profiling by setting MG_ENABLE_PROFILE=1
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// Invoke MG_PROF_ADD(c, "MY_EVENT_1") in the places you'd like to measure
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#if MG_ENABLE_PROFILE
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struct mg_profitem {
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const char *name; // Event name
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uint32_t timestamp; // Milliseconds since connection creation (MG_EV_OPEN)
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};
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#define MG_PROFILE_ALLOC_GRANULARITY 256 // Can save 32 items wih to realloc
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// Adding a profile item to the c->prof. Must be as fast as possible.
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// Reallocation of the c->prof iobuf is not desirable here, that's why we
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// pre-allocate c->prof with MG_PROFILE_ALLOC_GRANULARITY.
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// This macro just inits and copies 8 bytes, and calls mg_millis(),
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// which should be fast enough.
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#define MG_PROF_ADD(c, name_) \
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do { \
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struct mg_iobuf *io = &c->prof; \
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uint32_t inittime = ((struct mg_profitem *) io->buf)->timestamp; \
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struct mg_profitem item = {name_, (uint32_t) mg_millis() - inittime}; \
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mg_iobuf_add(io, io->len, &item, sizeof(item)); \
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} while (0)
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// Initialising profile for a new connection. Not time sensitive
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#define MG_PROF_INIT(c) \
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do { \
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struct mg_profitem first = {"init", (uint32_t) mg_millis()}; \
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mg_iobuf_init(&(c)->prof, 0, MG_PROFILE_ALLOC_GRANULARITY); \
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mg_iobuf_add(&c->prof, c->prof.len, &first, sizeof(first)); \
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} while (0)
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#define MG_PROF_FREE(c) mg_iobuf_free(&(c)->prof)
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// Dumping the profile. Not time sensitive
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#define MG_PROF_DUMP(c) \
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do { \
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struct mg_iobuf *io = &c->prof; \
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struct mg_profitem *p = (struct mg_profitem *) io->buf; \
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struct mg_profitem *e = &p[io->len / sizeof(*p)]; \
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MG_INFO(("%lu profile:", c->id)); \
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while (p < e) { \
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MG_INFO(("%5lx %s", (unsigned long) p->timestamp, p->name)); \
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p++; \
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} \
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} while (0)
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#else
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#define MG_PROF_INIT(c)
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#define MG_PROF_FREE(c)
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#define MG_PROF_ADD(c, name)
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#define MG_PROF_DUMP(c)
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#endif
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