Mercurial > kallithea
annotate docs/usage/performance.rst @ 6112:9dfabbf93361
changelog: add tags in changelog for bumpedtag, divergenttag, extincttag, unstabletag
author | domruf <dominikruf@gmail.com> |
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date | Fri, 24 Jun 2016 19:57:04 +0200 |
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1 .. _performance: |
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2 |
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3 ================================ |
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4 Optimizing Kallithea performance |
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5 ================================ |
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6 |
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7 When serving a large amount of big repositories, Kallithea can start |
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8 performing slower than expected. Because of the demanding nature of handling large |
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9 amounts of data from version control systems, here are some tips on how to get |
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10 the best performance. |
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11 |
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12 Follow these few steps to improve performance of Kallithea system. |
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13 |
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14 1. Kallithea is often I/O bound, and hence a fast disk (SSD/SAN) is |
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15 usually more important than a fast CPU. |
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16 |
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17 2. Increase cache |
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18 |
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19 Tweak beaker cache settings in the ini file. The actual effect of that |
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20 is questionable. |
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21 |
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22 3. Switch from SQLite to PostgreSQL or MySQL |
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23 |
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24 SQLite is a good option when having a small load on the system. But due to |
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25 locking issues with SQLite, it is not recommended to use it for larger |
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26 deployments. Switching to MySQL or PostgreSQL will result in an immediate |
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27 performance increase. A tool like SQLAlchemyGrate_ can be used for |
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28 migrating to another database platform. |
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29 |
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30 4. Scale Kallithea horizontally |
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32 Scaling horizontally can give huge performance benefits when dealing with |
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33 large amounts of traffic (many users, CI servers, etc.). Kallithea can be |
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34 scaled horizontally on one (recommended) or multiple machines. In order |
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35 to scale horizontally you need to do the following: |
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36 |
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37 - Each instance's ``data`` storage needs to be configured to be stored on a |
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38 shared disk storage, preferably together with repositories. This ``data`` |
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39 dir contains template caches, sessions, whoosh index and is used for |
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40 task locking (so it is safe across multiple instances). Set the |
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41 ``cache_dir``, ``index_dir``, ``beaker.cache.data_dir``, ``beaker.cache.lock_dir`` |
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42 variables in each .ini file to a shared location across Kallithea instances |
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43 - If celery is used each instance should run a separate Celery instance, but |
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44 the message broker should be common to all of them (e.g., one |
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45 shared RabbitMQ server) |
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46 - Load balance using round robin or IP hash, recommended is writing LB rules |
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47 that will separate regular user traffic from automated processes like CI |
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48 servers or build bots. |
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49 |
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50 5. Serve static files directly from the web server |
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51 |
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52 With the default ``static_files`` ini setting, the Kallithea WSGI application |
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53 will take care of serving the static files found in ``kallithea/public`` from |
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54 the root of the application URL. While doing that, it will currently also |
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55 apply buffering and compression of all the responses it is serving. |
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56 |
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57 The actual serving of the static files is unlikely to be a problem in a |
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58 Kallithea setup. The buffering of responses is more likely to be a problem; |
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59 large responses (clones or pulls) will have to be fully processed and spooled |
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60 to disk or memory before the client will see any response. |
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61 |
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62 To serve static files from the web server, use something like this Apache config |
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63 snippet:: |
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64 |
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65 Alias /images/ /srv/kallithea/kallithea/kallithea/public/images/ |
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66 Alias /css/ /srv/kallithea/kallithea/kallithea/public/css/ |
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67 Alias /js/ /srv/kallithea/kallithea/kallithea/public/js/ |
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68 Alias /codemirror/ /srv/kallithea/kallithea/kallithea/public/codemirror/ |
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69 Alias /fontello/ /srv/kallithea/kallithea/kallithea/public/fontello/ |
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70 |
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71 Then disable serving of static files in the ``.ini`` ``app:main`` section:: |
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72 |
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73 static_files = false |
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74 |
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75 If using Kallithea installed as a package, you should be able to find the files |
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76 under site-packages/kallithea, either in your Python installation or in your |
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77 virtualenv. When upgrading, make sure to update the web server configuration |
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78 too if necessary. |
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79 |
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80 |
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81 .. _SQLAlchemyGrate: https://github.com/shazow/sqlalchemygrate |