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IRIX 6.5 Applications 1999 May
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SGI IRIX 6.5 Applications 1999 May.iso
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arraysvcs
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ch5.z
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1999-04-19
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5. _K_n_o_w_n__P_r_o_b_l_e_m_s__a_n_d__W_o_r_k_a_r_o_u_n_d_s
+o ArrayView and other array services client programs may
not "see" machines that are not able to respond to
requests within the default timeout period of 15
seconds. In situations where high load or long network
delays cause timeouts to occur, it is possible to
increase the default timeout period by setting the
environment variable ARRAYD_TIMEOUT to a new timeout
period in seconds. In addition, many array services
clients (though not ArrayView) support a "-timeout"
command line option to specify a new timeout value on a
case-by-case basis.
+o There is a further restriction concerning checkpointing
of MPI applications which run using array services.
The MPI application must consist of a single a.out
program. It cannot be constructed using a.out & b.out.
When using two programs, they will communicate via
sockets (this is in libmpi). Since sockets and
checkpointing do not get along, this application can
not be checkpointed.
+o The ps(1) command does not display any information on
which array session a given process belongs to. (Bug
#479281)
+o The arrayd.conf parsing code treats the word "user" as
a token, not a generic string. Thus, if you try to
specify the line: "GROUP USER" this is considered a
syntax error, since "group" should not ordinarily be
followed by a token. The parser should be smart enough
to treat a token as a string under these circumstances.
(Bug #518521)
+o Array services doesn't bother to propagate multiple
groups for remote execution, only the real and
effective group names are sent over. Also, array
services doesn't handle numeric group IDs, only actual
group *names* are sent to remote machines (Bug #521340)
+o Remote processes cannot execute with better than
default limits on priority (Bug #531024)
+o The weightless priority is not propogated to remote
processes. (Bug #592991)