constants.h

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/** @file storage/temptable/include/temptable/constants.h
TempTable constants. */
 
#ifndef TEMPTABLE_CONSTANTS_H
#define TEMPTABLE_CONSTANTS_H
 
#include "my_config.h"
 
namespace temptable {
 
/** Multiply a number by 1024.
 * @return n * 1024. */
constexpr unsigned long long operator""_KiB(
    /** [in] Number to multiply. */
    unsigned long long n) {
  return n << 10;
}
 
/** Multiply a number by 1024 * 1024.
 * @return n * 1024 * 1024. */
constexpr unsigned long long operator""_MiB(
    /** [in] Number to multiply. */
    unsigned long long n) {
  return n << 20;
}
 
/** Multiply a number by 1024 * 1024 * 1024.
 * @return n * 1024 * 1024 * 1024. */
constexpr unsigned long long operator""_GiB(
    /** [in] Number to multiply. */
    unsigned long long n) {
  return n << 30;
}
 
/** log2(allocator max block size in MiB). Ie.
 * 2 ^ ALLOCATOR_MAX_BLOCK_MB_EXP * 1024^2 = ALLOCATOR_MAX_BLOCK_BYTES. */
constexpr size_t ALLOCATOR_MAX_BLOCK_MB_EXP = 9;
 
/** Limit on the size of a block created by `Allocator` (in bytes). A larger
 * block could still be created if a single allocation request with bigger size
 * is received. */
constexpr size_t ALLOCATOR_MAX_BLOCK_BYTES = 1_MiB
                                             << ALLOCATOR_MAX_BLOCK_MB_EXP;
 
/** `Storage` page size. */
constexpr size_t STORAGE_PAGE_SIZE = 64_KiB;
 
/** Number of buckets to have by default in a hash index. */
constexpr size_t INDEX_DEFAULT_HASH_TABLE_BUCKETS = 1024;
 
/** Store build-type information into the constexpr expression. */
#ifndef NDEBUG
constexpr bool DEBUG_BUILD = true;
#else
constexpr bool DEBUG_BUILD = false;
#endif /* NDEBUG */
 
/** Store L1-dcache size information into the constexpr expression. */
constexpr size_t L1_DCACHE_SIZE = CPU_LEVEL1_DCACHE_LINESIZE;
 
/** Number of shards in key-value store. */
constexpr size_t KV_STORE_SHARDS_COUNT = 16 * 1024;
 
/** Size of a pool containing shared-blocks. */
constexpr size_t SHARED_BLOCK_POOL_SIZE = 16 * 1024;
 
} /* namespace temptable */
 
#endif /* TEMPTABLE_CONSTANTS_H */