Tomasz Grabiec f48fa542fc gdb: Extend 'scylla memory' to show memory used by large allocations
Adds new columns to the "Page spans" table named "large [B]" and
"[spans]", which shows how much memory is allocated in spans of given
size. Excludes spans used by small pools.

Useful in determining what is the size of large allocations which
consume the memory.

Example output:

Page spans:
index      size [B]      free [B]     large [B] [spans]
    0          4096          4096          4096       1
    1          8192         32768             0       0
    2         16384         16384             0       0
    3         32768         98304       2785280      85
    4         65536         65536       1900544      29
    5        131072        524288     471597056    3598
...
   31 8796093022208             0             0       0
Large allocations: 484675584 [B]
Message-Id: <1548956406-7601-1-git-send-email-tgrabiec@scylladb.com>
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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. Note: GCC >= 8.1.1 is require to compile 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>

Contributing to Scylla

Guidelines for contributing

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