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Speed up Snappy uncompression, new Logger interface.
- Removed one copy of an uncompressed block contents changing
the signature of Snappy_Uncompress() so it uncompresses into a
flat array instead of a std::string.
Speeds up readrandom ~10%.
- Instead of a combination of Env/WritableFile, we now have a
Logger interface that can be easily overridden applications
that want to supply their own logging.
- Separated out the gcc and Sun Studio parts of atomic_pointer.h
so we can use 'asm', 'volatile' keywords for Sun Studio.
git-svn-id: https://leveldb.googlecode.com/svn/trunk@39 62dab493-f737-651d-591e-8d6aee1b9529
baseline
gabor@google.com
13 years ago
17 changed files with 261 additions and 212 deletions
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+4 -3db/db_bench.cc
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+17 -28db/db_impl.cc
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+10 -10db/repair.cc
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+2 -2db/version_set.cc
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+23 -6include/leveldb/env.h
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+3 -3include/leveldb/options.h
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+11 -3port/atomic_pointer.h
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+7 -1port/port_android.h
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+11 -7port/port_chromium.cc
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+3 -1port/port_chromium.h
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+11 -1port/port_example.h
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+15 -11port/port_posix.h
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+12 -8table/format.cc
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+10 -5util/env.cc
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+13 -61util/env_chromium.cc
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+12 -62util/env_posix.cc
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+97 -0util/posix_logger.h
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db/db_bench.cc
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db/db_impl.cc
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db/repair.cc
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db/version_set.cc
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include/leveldb/env.h
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include/leveldb/options.h
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port/atomic_pointer.h
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port/port_android.h
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port/port_chromium.cc
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port/port_chromium.h
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port/port_example.h
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port/port_posix.h
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table/format.cc
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util/env.cc
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util/env_chromium.cc
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util/env_posix.cc
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util/posix_logger.h
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| @ -0,0 +1,97 @@ | |||
| // Copyright 2011 Google Inc. All Rights Reserved. | |||
| // Author: sanjay@google.com (Sanjay Ghemawat) | |||
| // | |||
| // Logger implementation that can be shared by all environments | |||
| // where enough posix functionality is available. | |||
| #ifndef STORAGE_LEVELDB_UTIL_POSIX_LOGGER_H_ | |||
| #define STORAGE_LEVELDB_UTIL_POSIX_LOGGER_H_ | |||
| #include <algorithm> | |||
| #include <stdio.h> | |||
| #include <sys/time.h> | |||
| #include <time.h> | |||
| #include "leveldb/env.h" | |||
| namespace leveldb { | |||
| class PosixLogger : public Logger { | |||
| private: | |||
| FILE* file_; | |||
| uint64_t (*gettid_)(); // Return the thread id for the current thread | |||
| public: | |||
| PosixLogger(FILE* f, uint64_t (*gettid)()) : file_(f), gettid_(gettid) { } | |||
| virtual ~PosixLogger() { | |||
| fclose(file_); | |||
| } | |||
| virtual void Logv(const char* format, va_list ap) { | |||
| const uint64_t thread_id = (*gettid_)(); | |||
| // We try twice: the first time with a fixed-size stack allocated buffer, | |||
| // and the second time with a much larger dynamically allocated buffer. | |||
| char buffer[500]; | |||
| for (int iter = 0; iter < 2; iter++) { | |||
| char* base; | |||
| int bufsize; | |||
| if (iter == 0) { | |||
| bufsize = sizeof(buffer); | |||
| base = buffer; | |||
| } else { | |||
| bufsize = 30000; | |||
| base = new char[bufsize]; | |||
| } | |||
| char* p = base; | |||
| char* limit = base + bufsize; | |||
| struct timeval now_tv; | |||
| gettimeofday(&now_tv, NULL); | |||
| const time_t seconds = now_tv.tv_sec; | |||
| struct tm t; | |||
| localtime_r(&seconds, &t); | |||
| p += snprintf(p, limit - p, | |||
| "%04d/%02d/%02d-%02d:%02d:%02d.%06d %llx ", | |||
| t.tm_year + 1900, | |||
| t.tm_mon + 1, | |||
| t.tm_mday, | |||
| t.tm_hour, | |||
| t.tm_min, | |||
| t.tm_sec, | |||
| static_cast<int>(now_tv.tv_usec), | |||
| static_cast<long long unsigned int>(thread_id)); | |||
| // Print the message | |||
| if (p < limit) { | |||
| va_list backup_ap; | |||
| va_copy(backup_ap, ap); | |||
| p += vsnprintf(p, limit - p, format, backup_ap); | |||
| va_end(backup_ap); | |||
| } | |||
| // Truncate to available space if necessary | |||
| if (p >= limit) { | |||
| if (iter == 0) { | |||
| continue; // Try again with larger buffer | |||
| } else { | |||
| p = limit - 1; | |||
| } | |||
| } | |||
| // Add newline if necessary | |||
| if (p == base || p[-1] != '\n') { | |||
| *p++ = '\n'; | |||
| } | |||
| assert(p <= limit); | |||
| fwrite(base, 1, p - base, file_); | |||
| fflush(file_); | |||
| if (base != buffer) { | |||
| delete[] base; | |||
| } | |||
| break; | |||
| } | |||
| } | |||
| }; | |||
| } | |||
| #endif // STORAGE_LEVELDB_UTIL_POSIX_LOGGER_H_ | |||