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Bug 1168152 P1 Use a smaller sqlite page size and a growth increment in Cache. r=ehsan

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This commit is contained in:
Ben Kelly 2015-05-28 07:46:47 -07:00
parent 135c3feeb7
commit af1e1065d6
1 changed files with 41 additions and 14 deletions
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55
dom/cache/DBSchema.cpp vendored
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@ -29,13 +29,27 @@ namespace dom {
namespace cache {
namespace db {
const int32_t kMaxWipeSchemaVersion = 9;
const int32_t kMaxWipeSchemaVersion = 10;
namespace {
const int32_t kLatestSchemaVersion = 9;
const int32_t kLatestSchemaVersion = 10;
const int32_t kMaxEntriesPerStatement = 255;
const uint32_t kPageSize = 4 * 1024;
// Grow the database in chunks to reduce fragmentation
const uint32_t kGrowthSize = 64 * 1024;
const uint32_t kGrowthPages = kGrowthSize / kPageSize;
static_assert(kGrowthSize % kPageSize == 0,
"Growth size must be multiple of page size");
// Limit WAL journal to a reasonable size
const uint32_t kWalAutoCheckpointSize = 512 * 1024;
const uint32_t kWalAutoCheckpointPages = kWalAutoCheckpointSize / kPageSize;
static_assert(kWalAutoCheckpointSize % kPageSize == 0,
"WAL checkpoint size must be multiple of page size");
} // anonymous namespace
// If any of the static_asserts below fail, it means that you have changed
@ -380,24 +394,37 @@ InitializeConnection(mozIStorageConnection* aConn)
// This function needs to perform per-connection initialization tasks that
// need to happen regardless of the schema.
nsAutoCString pragmas(
nsPrintfCString pragmas(
// Use a smaller page size to improve perf/footprint; default is too large
"PRAGMA page_size = %u; "
// WAL journal can grow to given number of *pages*
"PRAGMA wal_autocheckpoint = %u; "
// Always truncate the journal back to given number of *bytes*
"PRAGMA journal_size_limit = %u; "
// WAL must be enabled at the end to allow page size to be changed, etc.
"PRAGMA journal_mode = WAL; "
// Use default mozStorage 32kb page size for now
// WAL journal can grow to 512kb before being flushed to disk
"PRAGMA wal_autocheckpoint = 16; "
// Always truncate the journal back to 512kb after large transactions
"PRAGMA journal_size_limit = 524288; "
"PRAGMA foreign_keys = ON; "
// Note, the default encoding of UTF-8 is preferred. mozStorage does all
// the work necessary to convert UTF-16 nsString values for us. We don't
// need ordering and the binary equality operations are correct. So, do
// NOT set PRAGMA encoding to UTF-16.
"PRAGMA foreign_keys = ON; ",
kPageSize,
kWalAutoCheckpointPages,
kWalAutoCheckpointSize
);
// Note, the default encoding of UTF-8 is preferred. mozStorage does all
// the work necessary to convert UTF-16 nsString values for us. We don't
// need ordering and the binary equality operations are correct. So, do
// NOT set PRAGMA encoding to UTF-16.
nsresult rv = aConn->ExecuteSimpleSQL(pragmas);
if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
// Limit fragmentation by growing the database by many pages at once.
rv = aConn->SetGrowthIncrement(kGrowthSize, EmptyCString());
if (rv == NS_ERROR_FILE_TOO_BIG) {
NS_WARNING("Not enough disk space to set sqlite growth increment.");
rv = NS_OK;
}
if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
return NS_OK;
}