GAP (scscp) - Chapter 2: Installation

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2 Installation
2.1 Installation and system requirements
2.2 Configuration files

### 2 Installation

#### 2.1 Installation and system requirements

Both SCSCP client and server for GAP work in Linux, OS X and Windows.

To use the SCSCP package it is necessary to install recent versions of GAP4 packages IO [Neu], GAPDoc [LN] and OpenMath [CKNS].

The SCSCP package is distributed in standard formats (`tar.gz`, `tar.bz2`) and can be obtained from https://gap-packages.github.io/scscp/ or from the GAP web site (the latter also offers `win.zip`-archives). To install SCSCP package, put its `tar.gz`-archive into the `pkg` subdirectory of your GAP4 installation and enter the command `tar -xzf scscp-X.X.X.tar.gz`, then the subdirectory `scscp` (containing subdirectories `doc`, `lib` etc.) will be created in the `pkg` subdirectory. Installation using other archive formats is performed in a similar way.

When there are no access rights to the root directory of the main GAP installation, it is also possible to install the package outside the GAP main directory by unpacking it inside a directory `MYGAPDIR/pkg`. Then to load the package GAP should be started with `-l ";MYGAPDIR"` option.

#### 2.2 Configuration files

There are four files in the package which may need to be modified to setup and customise the package. The first three files are related with the server's functionality:

- `scscp/config.g` specifies:

  - default `InfoLevel` for the `InfoSCSCP` (9.2-1) class;

  - default SCSCP server name and port to be used by `RunSCSCPserver` (5.2-1) if GAP is started with the `scscp/example/myserver.g` file;

  - whether the server accepts calls to procedures which are standard OpenMath symbols, or only procedures installed in the transient content dictionary (see `InstallSCSCPprocedure` (5.1-1));

  - service description to be returned to the client by `GetServiceDescription` (5.3-1).

- `scscp/gapd.sh` is the script to start the GAP SCSCP server as a daemon. To use it, adjust the local call of GAP and, if necessary, call options (for example, memory usage, startup from the workspace etc.) and the location of the root directory of the SCSCP package in section 1 of this script.

- `scscp/example/myserver.g` is an example of the server configuration file which loads all necessary packages, reads all needed code, installs all procedures which will be exposed to the client and finally starts the SCSCP server (see Chapter 5).

The fourth file is related with the client's functionality for parallel computations:

- The file `scscp/configpar.g` assigns the global variable `SCSCPservers` which specifies a list of hosts and ports to search for SCSCP services (which may be not only represented by GAP services, but also by another SCSCP-compliant systems). It will be used to run parallel computations with the SCSCP package (see Chapter 8).

See comments in these configuration files for further details and examples.

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