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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
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- +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)
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