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phish_query() function

C syntax: 

int phish_query(char *keyword, int flag1, int flag2)
void phish_set(char *keyword, int flag1, int flag2)

C examples: 

#include "phish.h"
int nlocal = phish_query("nlocal",0,0);
int nrecv = phish_query("outport/direct",2,0);
phish_set("ring/receiver",0,3);

C++ syntax: 

int query(char *keyword, int flag1, int flag2)
void set(char *keyword, int flag1, int flag2)

C++ examples: 

#include "phish.hpp"
int nlocal = phish::query("nlocal",0,0);
int nrecv = phish::query("outport/direct",2,0);
phish::set("ring/receiver",0,3);

Python syntax: 

def query(str,flag1,flag2)
def set(str,flag1,flag2)

Python examples: 

import phish
nlocal = phish.query("nlocal",0,0)
nrecv = phish.query("outport/direct",2,0)
phish.set("ring/receiver",0,3)

Description:

These are PHISH library functions which can be called from a minnow application. In PHISH lingo, a "minnow" is a stand-alone application which makes calls to the PHISH library.

These functions are used to query and reset information stored internally in PHISH. New keywords may be added as usage cases arise.

For phish_query, the "idlocal", "nlocal", "idglobal", and "nglobal" keywords return info about the minnow and its relation to other minnows running the PHISH program. These keywords ignore the flag1 and flag2 values; they can simply be set to 0.

A PHISH program typically includes one or more sets of minnows, as specified in a PHISH input script. Each minnow in each set is an individual process. In a local sense, each minnow has a local-ID from 0 to Nlocal-1 within its set, where Nlocal is the number of minnows in the set. Globally, each minnow has a global-ID from 0 to Nglobal-1, where Nglobal is the total number of minnows. The global-IDs are ordered by set, so that minnows within each set have consecutive IDs. These IDs enable the PHISH library to orchestrate communication of datums between minnows in different sets. E.g. when running the MPI version of the PHISH library, the global-ID corresponsds to the rank ID of an MPI process, used in MPI_Send() and MPI_Recv() function calls.

For phish_query, the "inport/status", "inport/nconnect", and "inport/nminnows" keywords return info about the input ports that connect to the minnow by which it receives datums from other minnows. Likewise, the "outport/status", "outport/nconnect", "output/nminnows", and "output/direct" keywords return info about the output ports the minnow connects to by which it sends datums to other minnows.

All of these keywords require the use of flag1 to specify the input or output port, which is a number from 0 to Maxport-1. Some of them, as noted below, require the use of flag2 to specify the connection #, which is a number from 0 to Nconnect-1.

See this section of the PHISH Minnows doc page for more information about input and output ports.

See the hook command which is processed by the bait.py tool in a PHISH input script, to establish connections between sets of minnows.

The "status" keyword returns the status of the port, which is one of the following values:

The "nconnect" keyword returns the number of sets of minnows that are connected to a port.

The "nminnows" keyword returns the number of minnows connected to a port thru a specific connection, as specified by flag2.

The "outport/direct" keyword returns the number of minnows connected to an output port thru a connection of style direct. The first such connection found is used to return this value, so if another direct connection is desired, the "outport/nminnows" keyword should be used.

See the phish_send_direct function for a discussion of how datums are sent via direct style connections, and why this particular phish_query() keyword can be useful.

For phish_set, the "ring/receiver" keyword changes the minnow that this minnow sends messages to. This keyword can only be used when the minnow is part of school of minnows that is exchanging datums via a "ring" connection; see the hook command in PHISH input scripts that defines the ring connection. This keyword can be used to effectively permute the ordering of the minnows in the ring.

For ring/receiver, flag1 is the output port number. Flag2 is the new receiving minnow to send datums to on that port. It should be a value from 0 to Nring-1 inclusive, where Nring = the # of minnows in the ring.

Restrictions: none

Related commands:

phish_init