connection pool = number of database connections opened when the app opens
a database. These pooled connections are used by readers only and they
use the sqlite write-ahead-logging option to increase reader
concurrency.
The size of this connection pool depends on the number of CPUs, RAM etc.
On most single-core devices, this can be set to 1.
But on some multi-core devices with more RAM, pool size can be
more than 1.
On a device with more resources, here are the results of a test (in
coretests/src/android/database/sqlite/SQLiteDatabaseTest.java)
which measures the reader-parallelism achieved for different connection
pool sizes.
connpool-size = 1
num xacts by writer = 467
num-reads-in-xact/NOT-in-xact by reader1 = 1358/14542, by reader2 = 1431/14269
connpool-size = 2
num xacts by writer = 473
num-reads-in-xact/NOT-in-xact by reader1 = 5703/35227, by reader2 = 6222/35898
connpool-size = 3
num xacts by writer = 542
num-reads-in-xact/NOT-in-xact by reader1 = 6531/32329, by reader2 = 6252/32728
connpool-size = 4
num xacts by writer = 578
num-reads-in-xact/NOT-in-xact by reader1 = 6009/32701, by reader2 = 5977/32953
connpool-size = 5
num xacts by writer = 547
num-reads-in-xact/NOT-in-xact by reader1 = 6554/31186, by reader2 = 5318/31022
connpool-size = 6
num xacts by writer = 534
num-reads-in-xact/NOT-in-xact by reader1 = 5317/31463, by reader2 = 5413/31537
connpool-size = 7
num xacts by writer = 549
num-reads-in-xact/NOT-in-xact by reader1 = 5396/28004, by reader2 = 5214/28496
seems like connection pool size of 3 is optimal on this device.
Change-Id: I348ff5a31783c31b5e3e5ac78b7c2cea54ef114a
This code uses a try/finally to maintain the old behavior of setting
implCreated even if creation fails.
Change-Id: Ieac05568477db4908cd4087714cf00a9addd1d20
This constant is not public yet. Continuous autofocus should
behave differently in still camera and camcorder. In camcorder,
lens movement may be more smooth. And the triggers to start a
new focus search may be different. If there is a need,
FOCUS_MODE_CONTINUOUS_PHOTO can be added in the future.
Change-Id: I05df9e491aca37829be3df92a73b952f26c86a4a
Merge commit 'aac4630cc5b3076e3cd6f65c52c8ff5f8f921957'
* commit 'aac4630cc5b3076e3cd6f65c52c8ff5f8f921957':
provide link to backup guide above the fold
Merge commit '4735be0211a996f791accc77aeb399df2258ab4c'
* commit '4735be0211a996f791accc77aeb399df2258ab4c':
New error status for "destination file already exists".
Merge commit 'a4270e7e1e09bf5f60c65102d34e887033c5befa' into gingerbread-plus-aosp
* commit 'a4270e7e1e09bf5f60c65102d34e887033c5befa':
provide link to backup guide above the fold
Merge commit '73e150c886afc6cd92e8b065a58d61e0b2a098ed' into gingerbread
* commit '73e150c886afc6cd92e8b065a58d61e0b2a098ed':
provide link to backup guide above the fold
- New API for iterating over history that will allow a better implementation
in the future.
- Now do writes asynchronously.
Also improve the documentation for Activity.onRetainNonInstanceState().
Change-Id: Idf67f2796a8868eb62f288bcbb2bad29876c8554
Merge commit 'd2319d8d9a2d2bc5edc9d7d20b7100f4c72cb2e1' into gingerbread-plus-aosp
* commit 'd2319d8d9a2d2bc5edc9d7d20b7100f4c72cb2e1':
New error status for "destination file already exists".
Also changing the behavior of the local URI column slightly to better
match the spec -- it should return the client-provided destination so
that it's valid even if the download failed.
Change-Id: Ibf9c07519e647e677ebac8b334b9f2e930e47033
Merge commit '5b930c49b12bdb1461a18491db768c642c38d498' into gingerbread-plus-aosp
* commit '5b930c49b12bdb1461a18491db768c642c38d498':
SIP: add config flag for wifi-only configuration.
Merge commit '4258bfb7a9fb18907fbfbe79ec0a937b4e7382b1' into gingerbread-plus-aosp
* commit '4258bfb7a9fb18907fbfbe79ec0a937b4e7382b1':
Fix some drawing artifacts/bugs around overlays/text anchors
