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Comparing Compaq PVM to Standard PVM

This chapter lists a subset of the standard PVM functions, indicating if they are supported by Compaq PVM; describes the differences between the standard PVM and Compaq PVM daemons and consoles; and describes the sections in the PVM 3 User's Guide and Reference Manual which are not relevant when you are running Compaq PVM. The chapter consists of the following sections:

2.1 Standard PVM Functions Supported in Compaq PVM

Compaq PVM supports a subset of standard PVM functions. The following table shows which functions are supported and notes any restrictions and/or implementation differences:

PVM C Function	PVM Fortran Function	Compaq PVM Support?

pvm_addhosts	pvmfaddhost	Yes
pvm_archcode	pvmfarchode	Yes
pvm_barrier	pvmfbarrier	Yes
pvm_bcast	pvmfbcast	Yes
pvm_bufinfo	pvmbufinfo	Yes
pvm_catchout	pvmfcatchout	Yes
pvm_config	pvmfconfig	Yes
pvm_delete	-	Yes (see Note 9)
pvm_delhosts	pvmfdelhost	Yes
pvm_exit	pvmfexit	Yes
pvm_freebuf	pvmfreebuf	Yes
pvm_freezegroup	pvmffreezegroup	Yes
pvm_gather	pvmfgather	Yes
pvm_getfds	-	No
pvm_getinst	pvmfgetinst	No
pvm_getmwid	-	Yes
pvm_getopt	pvmfgetopt	Yes
pvm_getrbuf	pvmfgetrbuf	Yes
pvm_getsbuf	pvmfgetsbuf	Yes
pvm_gettmask	-	Yes
pvm_gettid	pvmfgettid	Yes
pvm_gsize	pvmfgsize	Yes
pvm_halt	pvmfhalt	Yes
pvm_hostsync	pvmfhostsync	Yes
pvm_initsend	pvmfinitsend	Yes (see Note 1)
pvm_insert	-	Yes (see Note 9)
pvm_joingroup	pvmfjoingroup	Yes
pvm_kill	pvmfkill	Yes
pvm_lookup	-	Yes (see Note 9)
pvm_lvgroup	pvmflvgroup	Yes
pvm_mcast	pvmfmcast	Yes (see Note 2)
pvm_mkbuf	pvmfmkbuf	Yes (see Note 1)
pvm_mstat	pvmfmstat	Yes
pvm_mytid	pvmfmytid	Yes
pvm_notify	pvmfnotify	Yes
pvm_nrecv	pvmfnrecv	Yes
pvm_packf	pvmfpack	Yes
pvm_parent	pvmfparent	Yes
pvm_perror	pvmfperror	Yes
pvm_pkbyte	pvmfpack	Yes
pvm_pkcplx	pvmfpack	Yes
pvm_pkdcplx	pvmfpack	Yes
pvm_pkdouble	pvmfpack	Yes
pvm_pkfloat	pvmfpack	Yes
pvm_pkint	pvmfpack	Yes
pvm_pklong	pvmfpack	Yes
pvm_pkshort	pvmfpack	Yes
pvm_pkstr	pvmfpack	Yes
pvm_pkuint	pvmfpack	Yes
pvm_pkulong	pvmfpack	Yes
pvm_pkushort	pvmfpack	Yes
pvm_precv	pvmfprecv	Yes
pvm_probe	pvmfprobe	Yes
pvm_psend	pvmfpsend	Yes
pvm_pstat	pvmfpstat	Yes
pvm_recv	pvmfrecv	Yes
pvm_recvf	-	Yes
pvm_reduce	pvmfreduce	Yes
pvm_reg_hoster	-	Yes
pvm_reg_rm	-	No
pvm_reg_tasker	-	Yes
pvm_scatter	pvmfscatter	Yes
pvm_send	pvmfsend	Yes
pvm_sendsig	pvmfsendsig	Yes
pvm_setmwid	-	No
pvm_setopt	pvmfsetopt	Yes (see Note 3)
pvm_setrbuf	pvmfsetrbuf	Yes
pvm_setsbuf	pvmfsetsbuf	Yes (see Note 4)
pvm_settmask	-	Yes
pvm_spawn	pvmfspawn	Yes (see Notes 5, 6)
pvm_start_pvmd	-	Yes (see Note 7)
pvm_tasks	pvmftasks	Yes (see Note 8)
pvm_tidtohost	pvmftidtohost	Yes
pvm_trecv	pvmftrecv	Yes
pvm_unpackf	pvmfunpack	Yes
pvm_upkbyte	pvmfunpack	Yes
pvm_upkcplx	pvmfunpack	Yes
pvm_upkdcplx	pvmfunpack	Yes
pvm_upkdouble	pvmfunpack	Yes
pvm_upkfloat	pvmfunpack	Yes
pvm_upkint	pvmfunpack	Yes
pvm_upklong	pvmfunpack	Yes
pvm_upkshort	pvmfunpack	Yes
pvm_upkstr	pvmfunpack	Yes
pvm_upkuint	pvmfunpack	Yes
pvm_upkulong	pvmfunpack	Yes
pvm_upkushort	pvmfunpack	Yes
pvm_version	-	Yes

Notes:

pvm_initsend() and pvm_mkbuf() use only the PvmDataRaw encoding format.
pvm_mcast() does not broadcast a message to every task at once. It sends the message to each task one after the other.
pvm_setopt() supports the following flags:
PvmDebugMask, PvmAutoErr, PvmOutputTid, PvmOutputCode, PvmTraceTid, PvmTraceCode, PvmShowTids
The other options are ignored.
If pvm_setsbuf() is being used to send the current receive buffer, it will only work if the buffer is not unpacked before any attempt to send it is made.
For pvm_spawn() to find the executable to be spawned, you must either:
- provide the full pathname of the program to be spawned, or
- ensure the spawned program is in one of the directories specified by the PATH environment variable on the target host.
pvm_spawn() does not support the PvmTaskArch and PvmMppFront flags.
pvm_tasks() does not support the status flag returned in the pvmtaskinfo structure. The value returned is always zero.
pvm_start_pvmd() starts up a local daemon only with none of the function parameters having an effect.
pvm_insert(), pvm_delete(), and pvm_lookup() are independent of the group functions. They do not provide any access to the mechanism used to implement the group functions.
Compaq PVM does not interoperate with other PVM implementations.
The PVMDLOGMAX environment variable is not supported.

2.2 Compaq PVM and Standard PVM Daemons and Consoles

The Compaq PVM daemon and console operate differently from the standard PVM daemon and console in the following ways:

None of the arguments for the standard PVM daemon are relevant in the Compaq PVM daemon.
The Compaq PVM console can take a hostfile as an argument. This hostfile consists of a host name per line. None of the additional arguments associated with the standard PVM hostfile are accepted, except the definition of the working directory using wd.
The name of the daemon in Compaq PVM is dpvmd. In standard PVM, it is pvmd3.
The name of the console in Compaq PVM is dpvm. In standard PVM, it is pvm.

2.3 Changes to PVM 3 User's Guide and Reference Manual

The sections in the PVM 3 User's Guide and Reference Manual not applicable to the Compaq PVM software are listed in the following table:

Section in PVM 3 User's Guide and Reference Manual	Action

Chapter 3: Getting and Installing PVM	See Chapter 1 of this manual
Chapter 4: PVM Console	Ignore the following: `pvm [-d<debugmask>] pvm -n<hostname>`
Section 4.1: Host File Options	Ignore
Sections 4.2, 4.3, 4.4	See Chapters 3 and 4 of this manual
Section 10.2: The PVM Daemon	See `dpvmd` -- Compaq PVM Daemon man page
Sections 10.1, 10.4, 10.8, 10.9, 10.10, 10.11	Ignore

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