User`s guide

Cray XMT™ Programming Environment User’s Guide
u Underflow. Traps underflows that occur. Underflows
produce a rounded result smaller in magnitude
than 0x0010000000000000, or about
2.225e-308.
x Inexact. Traps subnormal numbers.
max_readypool_retries n
Sets the maximum number n of retries that an idle thread can take
when checking random ready pools for new work.
mmap_buffer_size n
Sets the variable size of the persistent mmap buffers, where n is
the size in words. The maximum value, which is also the default,
is 16,777,216 words (16 GB). The size of the persistent buffers
determines how much tracing data can be gathered before requiring a
dump of the gathered data to the trace.out file.
must_dump_size n
Specifies the minimum number of words that must be present in a
trace buffer before allowing the trace buffer to dump to the mmap
buffer. The default value is 512 words. If an application terminates
prematurely and the trace.out file is missing information, reduce the
size of this buffer to force more frequent dumping.
num_procs n
Sets the maximum number of processors to use. This parameter is the
same as using the command mtarun -m n.
num_readypools n
Sets the maximum number n of ready pools available for the entire
task. Ready pools are used to schedule futures.
no_prereserve
Prevents the runtime from reserving 3 streams to use for attaching
the debugger.
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