NAME

qmake - distributed parallel make, scheduling by xxQS_NAMExx.

SYNTAX

qmake [ <options> ] -- [ <gmake_options> ]

DESCRIPTION

Qmake is a parallel, distributed make(1) utility. Scheduling of the parallel make tasks is done by xxQS_NAMExx. It is based on gmake (GNU make), version 4.4. Both xxQS_NAMExx and gmake command line options can be specified. They are separated by "--".

All xxQS_NAMExx options valid with qsub(1) or qrsh(1) can be specified with qmake - see submit(1) for a description of all xxQS_NAMExx command line options. The make(1) manual page describes the gmake command line syntax.

The syntax of qmake makefiles corresponds to gmake and is described in the "GNU Make Manual".

A typical qmake call will use the xxQS_NAMExx command line options -cwd to have a scheduled make started in the current working directory on the execution host, -v PATH if the xxQS_NAMExx environment is not setup in the users .cshrc or .profile shell resource file and request slots in a parallel environment (see xxqs_name_sxx__pe(5)).

If no resource request (xxQS_NAMExx command line option -l) is specified, qmake will use the environment variable SGE_ARCH to request the same architecture for task execution as has the submit host. If SGE_ARCH is set, the architecture specified in SGE_ARCH will be requested by inserting the option -l arch=$SGE_ARCH into the command line options. If SGE_ARCH is not set, the make tasks can be executed on any available architecture. As this is critical for typical make (compile) jobs, a warning will be output.

qmake has two different modes for allocating xxQS_NAMExx resources for the parallel execution of tasks:

Allocation of resources using a parallel environment. If the -pe option is used on the qmake command line, a parallel job is scheduled by xxQS_NAMExx. The make rules are executed as tasks within this parallel job.
Dynamic allocation of resources. If no parallel environment is requested when submitting a qmake job, each make rule will generate an individual xxQS_NAMExx qrsh job. All resource requests given to qmake will be inherited by the jobs processing the make rules.

In dynamic allocation mode, additional resource requests for individual rules can be specified by preceding the rule by the definition of an environment variable SGE_RREQ. The rule then takes the form SGE_RREQ="<request>" <rule>, e.g.

SGE_RREQ="-l lic=1" cc -c ...

If such makefile rules are executed in a make utility other than qmake, the environment variable SGE_RREQ will be set in the environment established for the rule's execution - without any effect.

EXAMPLES

qmake -cwd -v PATH -pe compiling 1-10 --

will request between 1 and 10 slots in parallel environment "compiling". If the SGE_ARCH environment variable is set to the machines architecture, a resource request will be inserted into the qmake command line to start the qmake job on the same architecture as the submit host. The make tasks will inherit the complete environment of the calling shell. It will execute as many parallel tasks as slots have been granted by xxQS_NAMExx.

qmake -l arch=lx-amd64 -cwd -v PATH -- -j 4

will submit each make rule as an individual qrsh job. A maximum of 4 tasks will be processed in parallel. The qmake job will be started on a machine of architecture lx-amd64, this resource request will also be inherited by the make tasks, i.e. all jobs created for the execution of make tasks will request the architecture lx-amd64.

If the following Makefile is submitted with the above command line, additional resource requests will be made for individual rules: For the compile and link rules, compiler licenses (comp) and linker licenses (link) will be requested, in addition to the resource request made for the whole job (-l arch=lx-amd64) on the command line.

all: test

clean:
	rm -f test main.o functions.o

test: main.o functions.o
	SGE_RREQ="-l link=1" ld -o test main.o functions.o

main.o: main.c
	SGE_RREQ="-l comp=1" cc -c -daliaspath=

functions.o: functions.c
 	SGE_RREQ="-l comp=1" cc -c -daliaspath=

The command line

qmake -cwd -v PATH -l arch=sol-sparc64 -pe make 3 --

will request three parallel make tasks to be executed on hosts of architecture "sol-sparc64". The submit may be done on a host of any architecture.

The shell script

#!/bin/sh
qmake -inherit --

can be submitted by

qsub -cwd -v PATH -pe make 1-10 [further xxqs_name_sxx options] <script>

Qmake will inherit the resources granted for the job submitted above under parallel environment make.

KNOWN PROBLEMS

Slow NFS server

Very low file server performance may lead to problems on depending files.

Example: Host a compiles a.c to a.o, host b compiles b.c to b.o, host c shall link program c from a.o and b.o. In case of very bad NFS performance, host c might not yet see files a.o and b.o.

Multiple commands in one rule

If multiple commands are executed in one rule, the makefile has to ensure that they are handled as one command line.

Example:

libx.a:
cd x
ar ru libx.a x.o

Building libx.a will fail, if the commands are executed in parallel (and possibly on different hosts). Write the following instead:

libx.a:
cd x ; ar ru libx.a x.o

libx.a:
cd x ; \
ar ru libx.a x.o

ENVIRONMENTAL VARIABLES

For a complete list of common environment variables used by all xxQS_NAMExx commands, see xxqs_name_sxx_intro(1).

FILES

For a complete list of files used by all xxQS_NAMExx commands, see xxqs_name_sxx_intro(1).

COPYRIGHT

Qmake contains portions of Gnu Make (gmake), which is the copyright of the Free Software Foundation, Inc., Boston, MA, and is protected by the Gnu General Public License. See xxqs_name_sxx_intro(1) and the information provided in <xxQS_NAME_Sxx_ROOT>/3rd_party/qmake for a statement of further rights and permissions.