The <linkxlink:href="https://support.citrix.com/article/CTX200337">selfservice</link> is an application managing Citrix desktops and applications. Please note that this feature only works with at least <package>citrix_workspace_20_06_0</package> and later versions.
</para>
<para>
In order to set this up, you first have to <linkxlink:href="https://its.uiowa.edu/support/article/102186">download the <literal>.cr</literal> file from the Netscaler Gateway</link>. After that you can configure the <command>selfservice</command> like this:
Arguments should be listed in the order they are used, with the
exception of <varname>lib</varname>, which always goes first.
Arguments should be listed in the order they are used, with the exception of <varname>lib</varname>, which always goes first.
</para>
</listitem>
<listitem>
<para>
Prefer using the top-level <varname>lib</varname> over its alias
<literal>stdenv.lib</literal>. <varname>lib</varname> is unrelated to
<varname>stdenv</varname>, and so <literal>stdenv.lib</literal> should only
be used as a convenience alias when developing to avoid having to modify
the function inputs just to test something out.
Prefer using the top-level <varname>lib</varname> over its alias <literal>stdenv.lib</literal>. <varname>lib</varname> is unrelated to <varname>stdenv</varname>, and so <literal>stdenv.lib</literal> should only be used as a convenience alias when developing to avoid having to modify the function inputs just to test something out.
If it’s a <emphasis>theme</emphasis> for a <emphasis>desktop environment</emphasis>,
a <emphasis>window manager</emphasis> or a <emphasis>display manager</emphasis>:
If it’s a <emphasis>theme</emphasis> for a <emphasis>desktop environment</emphasis>, a <emphasis>window manager</emphasis> or a <emphasis>display manager</emphasis>:
A number of attributes can be used to work with a derivation with multiple outputs. The attribute <varname>outputs</varname> is a list of strings, which are the names of the outputs. For each of these names, an identically named attribute is created, corresponding to that output. The attribute <varname>meta.outputsToInstall</varname> is used to determine the default set of outputs to install when using the derivation name unqualified.
This setup hook moves any systemd user units installed in the lib
subdirectory into share. In addition, a link is provided from share to
lib for compatibility. This is needed for systemd to find user services
when installed into the user profile.
This setup hook moves any systemd user units installed in the lib subdirectory into share. In addition, a link is provided from share to lib for compatibility. This is needed for systemd to find user services when installed into the user profile.
This is a special setup hook which helps in packaging proprietary software in that it automatically tries to find missing shared library dependencies of ELF files based on the given <varname>buildInputs</varname> and <varname>nativeBuildInputs</varname>.
</para>
<para>
You can also specify a <varname>runtimeDependencies</varname> variable which lists dependencies to be unconditionally added to <glossterm>rpath</glossterm> of all executables.
This is useful for programs that use <citerefentry>
You can also specify a <varname>runtimeDependencies</varname> variable which lists dependencies to be unconditionally added to <glossterm>rpath</glossterm> of all executables. This is useful for programs that use <citerefentry>
<refentrytitle>dlopen</refentrytitle>
<manvolnum>3</manvolnum></citerefentry> to load libraries at runtime.
Note that <literal>allowlistedLicenses</literal> only applies to unfree licenses unless <literal>allowUnfree</literal> is enabled. It is not a generic allowlist for all types of licenses. <literal>blocklistedLicenses</literal> applies to all licenses.
Note that <literal>allowlistedLicenses</literal> only applies to unfree licenses unless <literal>allowUnfree</literal> is enabled. It is not a generic allowlist for all types of licenses. <literal>blocklistedLicenses</literal> applies to all licenses.
Further overlays can be added by calling the <literal>pkgs.extend</literal> or <literal>pkgs.appendOverlays</literal>, although it is often preferable to avoid these functions, because they recompute the Nixpkgs fixpoint, which is somewhat expensive to do.
NOTE: DO NOT USE THIS in nixpkgs. Further overlays can be added by calling the <literal>pkgs.extend</literal> or <literal>pkgs.appendOverlays</literal>, although it is often preferable to avoid these functions, because they recompute the Nixpkgs fixpoint, which is somewhat expensive to do.
</para>
</section>
@ -139,98 +138,72 @@ self: super:
</para>
</section>
<sectionxml:id="sec-overlays-alternatives">
<title>Using overlays to configure alternatives</title>
<title>Using overlays to configure alternatives</title>
<para>
Certain software packages have different implementations of the same interface. Other distributions have functionality to switch between these. For example, Debian provides <link
xlink:href="https://wiki.debian.org/DebianAlternatives">DebianAlternatives</link>. Nixpkgs has what we call <literal>alternatives</literal>, which are configured through overlays.
MKL</link> (only works on the x86_64 architecture, unfree)
</para>
<para>
The Nixpkgs attribute is <literal>mkl</literal>.
</para>
</listitem>
<listitem>
<para>
<link
<para>
The Nixpkgs attribute is <literal>openblas</literal> for ILP64 (integer width = 64 bits) and <literal>openblasCompat</literal> for LP64 (integer width = 32 bits). <literal>openblasCompat</literal> is the default.
#83888</link>, we are able to override the <literal>blas</literal>
and <literal>lapack</literal> packages to use different implementations,
through the <literal>blasProvider</literal> and
<literal>lapackProvider</literal> argument. This can be used
to select a different provider. BLAS providers will have
symlinks in <literal>$out/lib/libblas.so.3</literal> and
<literal>$out/lib/libcblas.so.3</literal> to their respective
BLAS libraries. Likewise, LAPACK providers will have symlinks
in <literal>$out/lib/liblapack.so.3</literal> and
<literal>$out/lib/liblapacke.so.3</literal> to their respective
LAPACK libraries. For example, Intel MKL is both a BLAS and
LAPACK provider. An overlay can be created to use Intel MKL
that looks like:
</para>
<programlisting>
<para>
BLIS, available through the attribute <literal>blis</literal>, is a framework for linear algebra kernels. In addition, it implements the BLAS interface.
</para>
</listitem>
<listitem>
<para>
<link
xlink:href="https://developer.amd.com/amd-aocl/blas-library/">AMD BLIS/LIBFLAME</link> (optimized for modern AMD x86_64 CPUs)
</para>
<para>
The AMD fork of the BLIS library, with attribute <literal>amd-blis</literal>, extends BLIS with optimizations for modern AMD CPUs. The changes are usually submitted to the upstream BLIS project after some time. However, AMD BLIS typically provides some performance improvements on AMD Zen CPUs. The complementary AMD LIBFLAME library, with attribute <literal>amd-libflame</literal>, provides a LAPACK implementation.
</para>
</listitem>
</itemizedlist>
<para>
Introduced in <link
xlink:href="https://github.com/NixOS/nixpkgs/pull/83888">PR #83888</link>, we are able to override the <literal>blas</literal> and <literal>lapack</literal> packages to use different implementations, through the <literal>blasProvider</literal> and <literal>lapackProvider</literal> argument. This can be used to select a different provider. BLAS providers will have symlinks in <literal>$out/lib/libblas.so.3</literal> and <literal>$out/lib/libcblas.so.3</literal> to their respective BLAS libraries. Likewise, LAPACK providers will have symlinks in <literal>$out/lib/liblapack.so.3</literal> and <literal>$out/lib/liblapacke.so.3</literal> to their respective LAPACK libraries. For example, Intel MKL is both a BLAS and LAPACK provider. An overlay can be created to use Intel MKL that looks like:
</para>
<programlisting>
self: super:
{
@ -243,46 +216,24 @@ self: super:
};
}
</programlisting>
<para>
This overlay uses Intel’s MKL library for both BLAS and LAPACK
interfaces. Note that the same can be accomplished at runtime
using <literal>LD_LIBRARY_PATH</literal> of
<literal>libblas.so.3</literal> and
<literal>liblapack.so.3</literal>. For instance:
</para>
<para>
This overlay uses Intel’s MKL library for both BLAS and LAPACK interfaces. Note that the same can be accomplished at runtime using <literal>LD_LIBRARY_PATH</literal> of <literal>libblas.so.3</literal> and <literal>liblapack.so.3</literal>. For instance:
</para>
<screen>
<prompt>$ </prompt>LD_LIBRARY_PATH=$(nix-build -A mkl)/lib:$LD_LIBRARY_PATH nix-shell -p octave --run octave
</screen>
<para>
Intel MKL requires an <literal>openmp</literal> implementation
when running with multiple processors. By default,
<literal>mkl</literal> will use Intel’s <literal>iomp</literal>
implementation if no other is specified, but this is a
runtime-only dependency and binary compatible with the LLVM
implementation. To use that one instead, Intel recommends users
set it with <literal>LD_PRELOAD</literal>. Note that
<literal>mkl</literal> is only available on
<literal>x86_64-linux</literal> and
<literal>x86_64-darwin</literal>. Moreover, Hydra is not
building and distributing pre-compiled binaries using it.
</para>
<para>
For BLAS/LAPACK switching to work correctly, all packages must
depend on <literal>blas</literal> or <literal>lapack</literal>.
This ensures that only one BLAS/LAPACK library is used at one
time. There are two versions versions of BLAS/LAPACK currently
in the wild, <literal>LP64</literal> (integer size = 32 bits)
and <literal>ILP64</literal> (integer size = 64 bits). Some
software needs special flags or patches to work with
<literal>ILP64</literal>. You can check if
<literal>ILP64</literal> is used in Nixpkgs with
<varname>blas.isILP64</varname> and
<varname>lapack.isILP64</varname>. Some software does NOT work
with <literal>ILP64</literal>, and derivations need to specify
an assertion to prevent this. You can prevent
<literal>ILP64</literal> from being used with the following:
</para>
<programlisting>
<para>
Intel MKL requires an <literal>openmp</literal> implementation when running with multiple processors. By default, <literal>mkl</literal> will use Intel’s <literal>iomp</literal> implementation if no other is specified, but this is a runtime-only dependency and binary compatible with the LLVM implementation. To use that one instead, Intel recommends users set it with <literal>LD_PRELOAD</literal>. Note that <literal>mkl</literal> is only available on <literal>x86_64-linux</literal> and <literal>x86_64-darwin</literal>. Moreover, Hydra is not building and distributing pre-compiled binaries using it.
</para>
<para>
For BLAS/LAPACK switching to work correctly, all packages must depend on <literal>blas</literal> or <literal>lapack</literal>. This ensures that only one BLAS/LAPACK library is used at one time. There are two versions versions of BLAS/LAPACK currently in the wild, <literal>LP64</literal> (integer size = 32 bits) and <literal>ILP64</literal> (integer size = 64 bits). Some software needs special flags or patches to work with <literal>ILP64</literal>. You can check if <literal>ILP64</literal> is used in Nixpkgs with <varname>blas.isILP64</varname> and <varname>lapack.isILP64</varname>. Some software does NOT work with <literal>ILP64</literal>, and derivations need to specify an assertion to prevent this. You can prevent <literal>ILP64</literal> from being used with the following:
To provide MPI enabled applications that use <literal>MPICH</literal>, instead
of the default <literal>Open MPI</literal>, simply use the following overlay:
</para>
<programlisting>
</section>
<sectionxml:id="sec-overlays-alternatives-mpi">
<title>Switching the MPI implementation</title>
<para>
All programs that are built with <linkxlink:href="https://en.wikipedia.org/wiki/Message_Passing_Interface">MPI</link> support use the generic attribute <varname>mpi</varname> as an input. At the moment Nixpkgs natively provides two different MPI implementations:
<itemizedlist>
<listitem>
<para>
<linkxlink:href="https://www.open-mpi.org/">Open MPI</link> (default), attribute name <varname>openmpi</varname>
</para>
</listitem>
<listitem>
<para>
<linkxlink:href="https://www.mpich.org/">MPICH</link>, attribute name <varname>mpich</varname>
</para>
</listitem>
</itemizedlist>
</para>
<para>
To provide MPI enabled applications that use <literal>MPICH</literal>, instead of the default <literal>Open MPI</literal>, simply use the following overlay:
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Robert Hensing