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
Merge commit 'd23329df879993c71d9ba2d1e695f2dca8ef571c'
* commit 'd23329df879993c71d9ba2d1e695f2dca8ef571c':
DO NOT MERGE Enable debug in StatusBarService
Merge commit 'df59f257583730470085db65c7faf44960c3b32e' into gingerbread-plus-aosp
* commit 'df59f257583730470085db65c7faf44960c3b32e':
DO NOT MERGE Enable debug in StatusBarService
Merge commit '0ce12e210eaef554e96752af2553dadc431d6d09'
* commit '0ce12e210eaef554e96752af2553dadc431d6d09':
DO NOT MERGE. Wifi service now blames apps for its wake lock use.
Merge commit '65b5a65e790458be0d6f70fafa9e151ba22a9e2e'
* commit '65b5a65e790458be0d6f70fafa9e151ba22a9e2e':
In theory the package manager now scans /vendor/app
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 '5c7465220d52c64c87fe4566fe109c649ec5c4f7'
* commit '5c7465220d52c64c87fe4566fe109c649ec5c4f7':
support loading EGL libraries from /vendor/lib/egl as well as /system/lib/egl
This is a temporary enable to allow us to identify
the issue with multiple icons on StatusBar
Bug: 2984213
Change-Id: I36ac7baff6544c63fa44d9b2c7453bca6a33bd62
Also rename Geocoder.isImplemented() to Geocoder.isPresent()
BUG: 3000738
BUG: 3001413
Change-Id: I56bb4e9a9c59f8b79de585eeb168f74c3ff1a853
Signed-off-by: Mike Lockwood <lockwood@android.com>
Merge commit 'e25a264c4e3739913798d9b7d91af5dc964b0f15' into gingerbread-plus-aosp
* commit 'e25a264c4e3739913798d9b7d91af5dc964b0f15':
DO NOT MERGE. Wifi service now blames apps for its wake lock use.
Merge commit '4db643eb8430d063b1adc4ba164bfa1c1281bdf3' into gingerbread-plus-aosp
* commit '4db643eb8430d063b1adc4ba164bfa1c1281bdf3':
In theory the package manager now scans /vendor/app
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".
