Portability | GHC |
---|---|
Maintainer | Simon Meier <iridcode@gmail.com> |
Safe Haskell | None |
- toLazyByteStringWith :: AllocationStrategy -> ByteString -> Builder -> ByteString
- data AllocationStrategy
- safeStrategy :: Int -> Int -> AllocationStrategy
- untrimmedStrategy :: Int -> Int -> AllocationStrategy
- smallChunkSize :: Int
- defaultChunkSize :: Int
- byteStringCopy :: ByteString -> Builder
- byteStringInsert :: ByteString -> Builder
- byteStringThreshold :: Int -> ByteString -> Builder
- lazyByteStringCopy :: ByteString -> Builder
- lazyByteStringInsert :: ByteString -> Builder
- lazyByteStringThreshold :: Int -> ByteString -> Builder
- flush :: Builder
- intHost :: Int -> Builder
- int16Host :: Int16 -> Builder
- int32Host :: Int32 -> Builder
- int64Host :: Int64 -> Builder
- wordHost :: Word -> Builder
- word16Host :: Word16 -> Builder
- word32Host :: Word32 -> Builder
- word64Host :: Word64 -> Builder
- floatHost :: Float -> Builder
- doubleHost :: Double -> Builder
Execution strategies
:: AllocationStrategy | Buffer allocation strategy to use |
-> ByteString | Lazy |
-> Builder | Builder to execute |
-> ByteString | Resulting lazy |
Execute a Builder
with custom execution parameters.
This function is forced to be inlined to allow fusing with the allocation
strategy despite its rather heavy code-size. We therefore recommend
that you introduce a top-level function once you have fixed your strategy.
This avoids unnecessary code duplication.
For example, the default Builder
execution function toLazyByteString
is
defined as follows.
{--} toLazyByteString = toLazyByteStringWith (safeStrategy
smallChunkSize
defaultChunkSize
) empty
where empty
is the zero-length lazy ByteString
.
In most cases, the parameters used by toLazyByteString
give good
performance. A sub-performing case of toLazyByteString
is executing short
(<128 bytes) Builder
s. In this case, the allocation overhead for the first
4kb buffer and the trimming cost dominate the cost of executing the
Builder
. You can avoid this problem using
toLazyByteStringWith (safeStrategy 128 smallChunkSize) empty
This reduces the allocation and trimming overhead, as all generated
ByteString
s fit into the first buffer and there is no trimming
required, if more than 64 bytes are written.
data AllocationStrategy Source
A buffer allocation strategy for executing Builder
s.
:: Int | Size of first buffer |
-> Int | Size of successive buffers |
-> AllocationStrategy | An allocation strategy that guarantees that at least half of the allocated memory is used for live data |
Use this strategy for generating lazy ByteString
s whose chunks are
likely to survive one garbage collection. This strategy trims buffers
that are filled less than half in order to avoid spilling too much memory.
:: Int | Size of the first buffer |
-> Int | Size of successive buffers |
-> AllocationStrategy | An allocation strategy that does not trim any of the filled buffers before converting it to a chunk. |
Use this strategy for generating lazy ByteString
s whose chunks are
discarded right after they are generated. For example, if you just generate
them to write them to a network socket.
The recommended chunk size. Currently set to 4k, less the memory management overhead
The chunk size used for I/O. Currently set to 32k, less the memory management overhead
Controlling chunk boundaries
byteStringCopy :: ByteString -> BuilderSource
Construct a Builder
that copies the strict ByteString
.
Use this function to create Builder
s from smallish (<= 4kb
)
ByteString
s or if you need to guarantee that the ByteString
is not
shared with the chunks generated by the Builder
.
byteStringInsert :: ByteString -> BuilderSource
Construct a Builder
that always inserts the strict ByteString
directly as a chunk.
This implies flushing the output buffer, even if it contains just
a single byte. You should therefore use byteStringInsert
only for large
(> 8kb
) ByteString
s. Otherwise, the generated chunks are too
fragmented to be processed efficiently afterwards.
byteStringThreshold :: Int -> ByteString -> BuilderSource
Construct a Builder
that copies the strict ByteString
s, if it is
smaller than the treshold, and inserts it directly otherwise.
For example, byteStringThreshold 1024
copies strict ByteString
s whose size
is less or equal to 1kb, and inserts them directly otherwise. This implies
that the average chunk-size of the generated lazy ByteString
may be as
low as 513 bytes, as there could always be just a single byte between the
directly inserted 1025 byte, strict ByteString
s.
lazyByteStringCopy :: ByteString -> BuilderSource
Construct a Builder
that copies the lazy ByteString
.
lazyByteStringInsert :: ByteString -> BuilderSource
Construct a Builder
that inserts all chunks of the lazy ByteString
directly.
lazyByteStringThreshold :: Int -> ByteString -> BuilderSource
Construct a Builder
that uses the thresholding strategy of byteStringThreshold
for each chunk of the lazy ByteString
.
Host-specific binary encodings
wordHost :: Word -> BuilderSource
Encode a single native machine Word
. The Word
is encoded in host order,
host endian form, for the machine you're on. On a 64 bit machine the Word
is an 8 byte value, on a 32 bit machine, 4 bytes. Values encoded this way
are not portable to different endian or word sized machines, without
conversion.
word16Host :: Word16 -> BuilderSource
Encode a Word16
in native host order and host endianness.
word32Host :: Word32 -> BuilderSource
Encode a Word32
in native host order and host endianness.
word64Host :: Word64 -> BuilderSource
Encode a Word64
in native host order and host endianness.
floatHost :: Float -> BuilderSource
Encode a Float
in native host order. Values encoded this way are not
portable to different endian machines, without conversion.
doubleHost :: Double -> BuilderSource
Encode a Double
in native host order.