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We may fail to reclaim because a region has reclaim disabled (usually because it is in an allocating_section. Failed reclaims can cause high CPU usage if all of the lower addresses happen to be in a reclaim-disabled region (this is somewhat mitigated by the fact that checking for reclaim disabled is very cheap), but worse, failing a segment reclaim can lead to reclaimed memory being fragmented. This results in the original allocation continuing to fail. To combat that, we limit the number of failed reclaims. If we reach the limit, we fail the reclaim. The surrounding allocating_section will release the reclaim_lock, and increase reserves, which will result in reclaim being retried with all regions being reclaimable, and succeed in allocating contiguous memory.
Scylla
Quick-start
$ git submodule update --init --recursive
$ sudo ./install-dependencies.sh
$ ./configure.py --mode=release
$ ninja-build -j4 # Assuming 4 system threads.
$ ./build/release/scylla
$ # Rejoice!
Please see HACKING.md for detailed information on building and developing Scylla.
Running Scylla
- Run Scylla
./build/release/scylla
- run Scylla with one CPU and ./tmp as data directory
./build/release/scylla --datadir tmp --commitlog-directory tmp --smp 1
- For more run options:
./build/release/scylla --help
Building Fedora RPM
As a pre-requisite, you need to install Mock on your machine:
# Install mock:
sudo yum install mock
# Add user to the "mock" group:
usermod -a -G mock $USER && newgrp mock
Then, to build an RPM, run:
./dist/redhat/build_rpm.sh
The built RPM is stored in /var/lib/mock/<configuration>/result directory.
For example, on Fedora 21 mock reports the following:
INFO: Done(scylla-server-0.00-1.fc21.src.rpm) Config(default) 20 minutes 7 seconds
INFO: Results and/or logs in: /var/lib/mock/fedora-21-x86_64/result
Building Fedora-based Docker image
Build a Docker image with:
cd dist/docker
docker build -t <image-name> .
Run the image with:
docker run -p $(hostname -i):9042:9042 -i -t <image name>