spring-boot

Spring Boot

Andy Wilkinson 60ac2e5c09 Reduce the amount of garbage produced by JarFile Previously, working with a JarFile created a large amount of garbage that was allocated on the thread local allocation buffer (TLAB). The TLAB allocations made a significant contribution to GC pressure and slowed down startup. This commit reduces the amount of garbage by making a number of changes. Reading from a RandomAccessDataFile has been reworked to avoid creating new RandomAccessFile instances. A single RandomAccessFile is now created for an entire jar file and it is used to read data from anywhere in that jar file, including entries in nested jar files. To ensure that reads remain thread-safe, a lock is taken on the RandomAccessFile that is shared by all RandomAccessDataFile instances that are provided access to (portions of) the same jar file. Reading all of the bytes from a RandomAccessData has been reworked to avoid the use of an InputStream that was created, used to read the data, and then thrown away. In place of the InputStream-based mechanism a method has been introduced that returns all of the RandomAccessData as a byte[]. Building on this change, a method has also been introduced to read a portion of a RandomAccessData as a byte[]. This avoids the need to create a new RandomAccessData subsection where the subsection was only used to read its entire contents and then thrown away. Decoding of an MS-DOS datetime has been reworked to use LocalDataTime rather than GregorianCalendar. The former produces less garbage than the latter. Closes gh-12226	8 years ago
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src	Reduce the amount of garbage produced by JarFile	8 years ago
pom.xml	Allow individual builds of invoker plugin projects	8 years ago

Andy Wilkinson 60ac2e5c09 Reduce the amount of garbage produced by JarFile

Previously, working with a JarFile created a large amount of garbage
that was allocated on the thread local allocation buffer (TLAB).
The TLAB allocations made a significant contribution to GC pressure
and slowed down startup. This commit reduces the amount of garbage
by making a number of changes.

Reading from a RandomAccessDataFile has been reworked to avoid
creating new RandomAccessFile instances. A single RandomAccessFile
is now created for an entire jar file and it is used to read data from
anywhere in that jar file, including entries in nested jar files. To
ensure that reads remain thread-safe, a lock is taken on the
RandomAccessFile that is shared by all RandomAccessDataFile instances
that are provided access to (portions of) the same jar file.

Reading all of the bytes from a RandomAccessData has been reworked to
avoid the use of an InputStream that was created, used to read the
data, and then thrown away. In place of the InputStream-based
mechanism a method has been introduced that returns all of the
RandomAccessData as a byte[]. Building on this change, a method has
also been introduced to read a portion of a RandomAccessData as a
byte[]. This avoids the need to create a new RandomAccessData
subsection where the subsection was only used to read its entire
contents and then thrown away.

Decoding of an MS-DOS datetime has been reworked to use LocalDataTime
rather than GregorianCalendar. The former produces less garbage than
the latter.

Closes gh-12226

8 years ago

src

Reduce the amount of garbage produced by JarFile

8 years ago

pom.xml

Allow individual builds of invoker plugin projects

8 years ago