hi

machine has lots of memory, but still cant create pre-solve file, please take a look

this is the only MIP that is creating the error, other MIPs are fine

neos-3530905-gaula

------------------------------
srinivas tamvada
------------------------------
#DecisionOptimization

I read the MPS file into CPLEX 20.1 and ran it (on a very average desktop PC). Presolve took about 0.02 seconds. About 80 seconds in, the gap was 4.34% and the tree was approaching 500 MB.

------------------------------
Paul Rubin
Professor Emeritus
Michigan State University
------------------------------

can you please attach the  .pre file here

it does not work with version 12.10

edit: it is giving me the presolve time but it fails in the write, so maybe its a access rights error

------------------------------
srinivas tamvada
------------------------------

Original Message:
Sent: Mon February 15, 2021 05:12 PM
From: Paul Rubin
Subject: error 1103 generating presolved file

I read the MPS file into CPLEX 20.1 and ran it (on a very average desktop PC). Presolve took about 0.02 seconds. About 80 seconds in, the gap was 4.34% and the tree was approaching 500 MB.

------------------------------
Paul Rubin
Professor Emeritus
Michigan State University
------------------------------

When you load you model, CPLEX does not find any presolve model.
So, when you ask to serialize it, it raises an error.

What do you want to do with the presolved model?

------------------------------
Vincent Beraudier
------------------------------

Original Message:
Sent: Mon February 15, 2021 05:38 PM
From: srinivas tamvada
Subject: error 1103 generating presolved file

can you please attach the  .pre file here

it does not work with version 12.10

edit: it is giving me the presolve time but it fails in the write, so maybe its a access rights error

------------------------------
srinivas tamvada
------------------------------


Original Message:
Sent: Mon February 15, 2021 05:12 PM
From: Paul Rubin
Subject: error 1103 generating presolved file

I read the MPS file into CPLEX 20.1 and ran it (on a very average desktop PC). Presolve took about 0.02 seconds. About 80 seconds in, the gap was 4.34% and the tree was approaching 500 MB.

------------------------------
Paul Rubin
Professor Emeritus
Michigan State University

the pre-solved models are being used in a research project

here is the cut paste
 
Type 'help' for a list of available commands.
Type 'help' followed by a command name for more
information on commands.

CPLEX> read neos-3530905-gaula.mps
Selected objective sense: MINIMIZE
Selected objective name: R0201
Selected RHS name: B
Selected bound name: BOUND
Problem 'neos-3530905-gaula.mps' read.
Read time = 0.02 sec. (0.31 ticks)
CPLEX> write neos-3530905-gaula.pre
Version identifier: 12.10.0.0 | 2019-11-26 | 843d4de2ae
Tried aggregator 1 time.
No MIP presolve or aggregator reductions.
Presolve time = 0.02 sec. (3.49 ticks)
CPLEX Error 1103: No presolved problem created.
CPLEX>

------------------------------
srinivas tamvada
------------------------------

Original Message:
Sent: Tue February 16, 2021 05:06 AM
From: Vincent Beraudier
Subject: error 1103 generating presolved file

When you load you model, CPLEX does not find any presolve model.
So, when you ask to serialize it, it raises an error.

What do you want to do with the presolved model?

------------------------------
Vincent Beraudier
------------------------------


Original Message:
Sent: Mon February 15, 2021 05:38 PM
From: srinivas tamvada
Subject: error 1103 generating presolved file

can you please attach the  .pre file here

it does not work with version 12.10

edit: it is giving me the presolve time but it fails in the write, so maybe its a access rights error

------------------------------
srinivas tamvada


Original Message:
Sent: Mon February 15, 2021 05:12 PM
From: Paul Rubin
Subject: error 1103 generating presolved file

I read the MPS file into CPLEX 20.1 and ran it (on a very average desktop PC). Presolve took about 0.02 seconds. About 80 seconds in, the gap was 4.34% and the tree was approaching 500 MB.

------------------------------
Paul Rubin
Professor Emeritus
Michigan State University

Does the following work for you?

1. Read in the MPS file as above (using the interactive optimizer).
2. Set a node limit of zero ('set mip limits nodes 0').
3. "Solve" the model (by entering 'mip'). This will generate some cuts at the root node but should only take a fraction of a second.
4. Write the PRE file.

------------------------------
Paul Rubin
Professor Emeritus
Michigan State University
------------------------------

Original Message:
Sent: Tue February 16, 2021 06:40 AM
From: srinivas tamvada
Subject: error 1103 generating presolved file

the pre-solved models are being used in a research project

here is the cut paste
 
Type 'help' for a list of available commands.
Type 'help' followed by a command name for more
information on commands.

CPLEX> read neos-3530905-gaula.mps
Selected objective sense: MINIMIZE
Selected objective name: R0201
Selected RHS name: B
Selected bound name: BOUND
Problem 'neos-3530905-gaula.mps' read.
Read time = 0.02 sec. (0.31 ticks)
CPLEX> write neos-3530905-gaula.pre
Version identifier: 12.10.0.0 | 2019-11-26 | 843d4de2ae
Tried aggregator 1 time.
No MIP presolve or aggregator reductions.
Presolve time = 0.02 sec. (3.49 ticks)
CPLEX Error 1103: No presolved problem created.
CPLEX>

------------------------------
srinivas tamvada
------------------------------


Original Message:
Sent: Tue February 16, 2021 05:06 AM
From: Vincent Beraudier
Subject: error 1103 generating presolved file

When you load you model, CPLEX does not find any presolve model.
So, when you ask to serialize it, it raises an error.

What do you want to do with the presolved model?

------------------------------
Vincent Beraudier


Original Message:
Sent: Mon February 15, 2021 05:38 PM
From: srinivas tamvada
Subject: error 1103 generating presolved file

can you please attach the  .pre file here

it does not work with version 12.10

edit: it is giving me the presolve time but it fails in the write, so maybe its a access rights error

------------------------------
srinivas tamvada


Original Message:
Sent: Mon February 15, 2021 05:12 PM
From: Paul Rubin
Subject: error 1103 generating presolved file

I read the MPS file into CPLEX 20.1 and ran it (on a very average desktop PC). Presolve took about 0.02 seconds. About 80 seconds in, the gap was 4.34% and the tree was approaching 500 MB.

------------------------------
Paul Rubin
Professor Emeritus
Michigan State University

thank you that worked.

------------------------------
srinivas tamvada
------------------------------

Original Message:
Sent: Tue February 16, 2021 11:48 AM
From: Paul Rubin
Subject: error 1103 generating presolved file

Does the following work for you?

1. Read in the MPS file as above (using the interactive optimizer).
2. Set a node limit of zero ('set mip limits nodes 0').
3. "Solve" the model (by entering 'mip'). This will generate some cuts at the root node but should only take a fraction of a second.
4. Write the PRE file.

------------------------------
Paul Rubin
Professor Emeritus
Michigan State University
------------------------------


Original Message:
Sent: Tue February 16, 2021 06:40 AM
From: srinivas tamvada
Subject: error 1103 generating presolved file

the pre-solved models are being used in a research project

here is the cut paste
 
Type 'help' for a list of available commands.
Type 'help' followed by a command name for more
information on commands.

CPLEX> read neos-3530905-gaula.mps
Selected objective sense: MINIMIZE
Selected objective name: R0201
Selected RHS name: B
Selected bound name: BOUND
Problem 'neos-3530905-gaula.mps' read.
Read time = 0.02 sec. (0.31 ticks)
CPLEX> write neos-3530905-gaula.pre
Version identifier: 12.10.0.0 | 2019-11-26 | 843d4de2ae
Tried aggregator 1 time.
No MIP presolve or aggregator reductions.
Presolve time = 0.02 sec. (3.49 ticks)
CPLEX Error 1103: No presolved problem created.
CPLEX>

------------------------------
srinivas tamvada


Original Message:
Sent: Tue February 16, 2021 05:06 AM
From: Vincent Beraudier
Subject: error 1103 generating presolved file

When you load you model, CPLEX does not find any presolve model.
So, when you ask to serialize it, it raises an error.

What do you want to do with the presolved model?

------------------------------
Vincent Beraudier


Original Message:
Sent: Mon February 15, 2021 05:38 PM
From: srinivas tamvada
Subject: error 1103 generating presolved file

can you please attach the  .pre file here

it does not work with version 12.10

edit: it is giving me the presolve time but it fails in the write, so maybe its a access rights error

------------------------------
srinivas tamvada


Original Message:
Sent: Mon February 15, 2021 05:12 PM
From: Paul Rubin
Subject: error 1103 generating presolved file

I read the MPS file into CPLEX 20.1 and ran it (on a very average desktop PC). Presolve took about 0.02 seconds. About 80 seconds in, the gap was 4.34% and the tree was approaching 500 MB.

------------------------------
Paul Rubin
Professor Emeritus
Michigan State University