Performance

Basic Performance Report

Overview

This document tries to understand Orchidee MICT computing time behavior. In the latest version 6.5 it takes a lot of time to compute. Around 8h in 0.5 degrees for 1 year. So it is necessary to understand why It happens. Once the issues are identified it might be possible to apply different solutions.

In order to make such thing possible the code is profiled. Different tools are used (vtune, vampir, gprof, ...). They provide an easy way to identify basic hotspots in the code.

Report

attachment:performance_mict_albert_jornet_150616.pdf​

MICT V6 (3344 + PFT interpolation) Module computing time

Starting from a basic configuration. At each test a new module is activated. This increases the numbers of modules at each test. Its purposes is to show the impact of each module when is used.

Trunk vs MICT Comparision 11/04/2016

• Date 11/04/2016
• ADA Machine
• IOIPSL production mode
• Orchidee production mode
• 1Y
• 16 cores
• Forcing:
  • 1 Degree
  • 3H

Considerations:

• MICT is in the same level of modifications as Trunk revision 3346
• MICT is using parallel interpolation for aggregate 2D subroutine

Overview

Subroutines are placed in 4 different groups described below:

• ioipsl: all subroutines related to IOIPSL library
• Top orchidee: subroutines >1% of computing time
• Interpolation: interpolation time by aggregate_2D subroutine
• other orchidee: remaining subroutines from orchidee

Mict R3359 (gprof)

This is a profiling test done with gprof tool:

Flat profile:

Each sample counts as 0.01 seconds.
  %   cumulative   self              self     total           
 time   seconds   seconds    calls  Ks/call  Ks/call  name    
 25.66   1383.92  1383.92  2245127     0.00     0.00  mathelp_mp_ma_fuscat_r21_
  9.62   1902.84   518.92  3835809     0.00     0.00  mathelp_mp_moycum_index_
  9.18   2398.02   495.18  3835826     0.00     0.00  histcom_mp_histwrite_real_
  5.96   2719.41   321.39    17524     0.00     0.00  thermosoil_mp_thermosoil_cond_pft_
  3.81   2924.90   205.49    17520     0.00     0.00  hydrol_mp_hydrol_soil_
  3.62   3119.87   194.97   420480     0.00     0.00  hydrol_mp_hydrol_soil_coef_
  3.59   3313.39   193.52    17524     0.00     0.00  thermosoil_mp_thermosoil_getdiff_
  3.11   3481.04   167.65      365     0.00     0.00  stomate_wet_ch4_pt_ter_wet2_mp_ch4_wet_flux_density_wet2_
  3.05   3645.33   164.29      365     0.00     0.00  stomate_wet_ch4_pt_ter_wet1_mp_ch4_wet_flux_density_wet1_
  2.92   3803.03   157.70      365     0.00     0.00  stomate_wet_ch4_pt_ter_wet3_mp_ch4_wet_flux_density_wet3_
  2.86   3957.34   154.31      365     0.00     0.00  stomate_wet_ch4_pt_ter_0_mp_ch4_wet_flux_density_0_
  2.74   4105.24   147.90      365     0.00     0.00  stomate_wet_ch4_pt_ter_wet4_mp_ch4_wet_flux_density_wet4_
  2.67   4249.50   144.26    17522     0.00     0.00  thermosoil_mp_thermosoil_coef_
  1.63   4337.37    87.87    17520     0.00     0.00  hydrol_mp_hydrol_diag_soil_
  1.59   4423.39    86.02  2666157     0.00     0.00  mod_orchidee_omp_transfert_mp_gather_omp_r1_
  1.57   4507.82    84.43       55     0.00     0.00  interpol_help_mp_aggregate_2d_
  1.37   4581.90    74.08    17520     0.00     0.00  diffuco_mp_diffuco_trans_co2_
  1.36   4655.06    73.16    17520     0.00     0.00  stomate_mp_stomate_main_
  1.22   4720.59    65.53    17520     0.00     0.00  stomate_permafrost_soilcarbon_mp_microactem_
  1.06   4777.86    57.27    17520     0.00     0.00  hydrol_mp_hydrol_main_
  0.96   4829.85    51.99  1602027     0.00     0.00  mathelp_mp_ma_fuscat_r11_
  0.77   4871.20    41.35    17522     0.00     0.00  thermosoil_mp_thermosoil_readjust_
  0.74   4911.35    40.15  2664512     0.00     0.00  mod_orchidee_omp_transfert_mp_gather_omp_i1_

Total Simulation time: 5358 seconds

IO: mathelp + histcom = 25.66 + 9.62 + 9.18 = ~45%

Trunk R3346

This is a profiling test done with gprof tool:

Flat profile:

Each sample counts as 0.01 seconds.
  %   cumulative   self              self     total           
 time   seconds   seconds    calls  Ks/call  Ks/call  name    
 22.26    441.54   441.54        7     0.06     0.06  interpol_help_mp_aggregate_2d_
 14.52    729.66   288.12  2171415     0.00     0.00  histcom_mp_histwrite_real_
 13.26    992.66   263.00    17520     0.00     0.00  hydrol_mp_hydrol_soil_
 10.28   1196.56   203.90   773813     0.00     0.00  mathelp_mp_ma_fuscat_r21_
  5.07   1297.17   100.61  2171397     0.00     0.00  mathelp_mp_moycum_index_
  4.16   1379.77    82.60    17520     0.00     0.00  diffuco_mp_diffuco_trans_co2_
  3.81   1455.34    75.57    17520     0.00     0.00  hydrol_mp_hydrol_diag_soil_
  3.67   1528.21    72.87   157680     0.00     0.00  hydrol_mp_hydrol_soil_coef_
  2.29   1573.69    45.48  1400412     0.00     0.00  mathelp_mp_ma_fuscat_r11_
  2.27   1618.76    45.07    17520     0.00     0.00  hydrol_mp_hydrol_main_
  1.86   1655.66    36.90    17521     0.00     0.00  thermosoil_mp_thermosoil_getdiff_
  1.46   1684.63    28.97    17521     0.00     0.00  thermosoil_mp_thermosoil_humlev_
  0.99   1704.17    19.54   157680     0.00     0.00  hydrol_mp_hydrol_soil_tridiag_
  0.94   1722.82    18.65    17520     0.00     0.00  stomate_litter_mp_littercalc_
  0.92   1740.99    18.17    17520     0.00     0.00  hydrol_mp_hydrol_split_soil_
  0.86   1758.10    17.11    17520     0.00     0.00  stomate_mp_stomate_main_
  0.81   1774.07    15.98  1133588     0.00     0.00  mod_orchidee_omp_transfert_mp_gather_omp_r1_

Total Simulation time: 1956 seconds

IO: mathelp + histcom = 14.25 + 10.28 + 5.07 = ~30%

Trunk vs MICT Comparision 18/02/2016

18/02/2016: revisions trunk 2916 and MICT 3161 were considered to be equivalents.

The same run.def file is used to compare both developments.

The simulations were carried out under the following conditions:

• 1 Year
• Global
• CRU-NCEP v5.3.2 (6 hourly)
• CURIE
• IO library: IOIPSL/XIOS
  • Yearly output
• Compilation mode IOIPSL: production
• Compilation mode Orchidee: production
• Compilation mode XIOS: production
  • e.g: 64 cores = 64 ORC + 1 XIOS

Configurations

• S0: no freeze + no explicitsnow + no ok_pc + no hydrol_cwrr
  • Used by default
• S1: S0 + freeze + explicitsnow + ok_pc + hydrol_cwrr
• S2: S1 + ch4_calcul
• S3: S2 + dgvm

Orchidee-CN-P R4758

N procs	8	16	32	64	128	256	512	1024
0.5 deg
1 deg
2 deg

MICT R4755 + IOIPSL align (S1)

N procs	8	16	32	64	128	256	512	1024
0.5 deg			2h45	1h22	43m52	25m25	19m05	19m49
1 deg		1h23	39m57	20m59	13m28	10m29	9m07	-
2 deg	43m33	21m11	11m24	6m53	4m46	4m03	4m20	-

MICT R4414 + IOIPSL align (S0)

N procs	8	16	32	64	128	256	512	1024
0.5 deg	11h50	5h29	2h33	1h14	37m02	25m	12m52	14m43
1 deg	2h41	1h17	38m41	18m44	10m32	9m
2 deg	40m	19m03	10m17	5m32	4m33	2m42

MICT R4385 + IOIPSL align (S2)

• Standard

N procs	8	16	32	64	128	256	512	1024
0.5 deg					42m40

• SOA ch4

N procs	8	16	32	64	128	256	512	1024
0.5 deg					41m34

MICT R4385 + IOIPSL align (S1)

• No restarts (unlimited IOIPSL):

N procs	8	16	32	64	128	256	512	1024
0.5 deg	12h17	5h42	2h41	1h17	38m12	21m39	13m52	14m58
1.0 deg	2h47	1h20	38m16	19m25	10m35	6m58	-	-
2.0 deg	42m	20m	10m29	6m12	4m32	3m03	-	-

• No restarts (limited IOIPSL): All running (_latest)

N procs	8	16	32	64	128	256	512	1024
0.5 deg	c	c	2h39	1h17	37m58	21m02	13m49	14m59

• With restarts (unlimited IOIPSL): All running (_latest_next)

N procs	8	16	32	64	128	256	512	1024
0.5 deg	c	c	2h46	1h24	43m51	31m	23m11	22m32

• With restarts (limited IOIPSL): (_latest_limitedio)

N procs	8	16	32	64	128	256	512	1024
0.5 deg					36m26	20m21	12m52	14m45

• No restarts (limited IOIPSL): thermosoil_cond_pft + no precise (_latest_refactor)

thermosoil_cond_pft is refactored again. Performance modifications were lost in previous commits. Refactorization + no procise allows the vectorization of pow and exp subroutines.

N procs	8	16	32	64	128	256	512	1024
0.5 deg					32m23

MICT R4289 + IOIPSL align (S1)

N procs	8	16	32	64	128	256	512
0.5 deg	13h	6h11	2h50	1h23	42m06	23m47	15m42
1.0 deg	2h57	1h26	42m13	20m18	10m51	7m19	-
2.0 deg	44m58	21m21	10m54	6m17	4m	2m56	-

MICT R4277 + interpolation (S1)

N procs	8	16	32	64	128	256	512
0.5 deg	16h39	8h05	3h38	1h42	50m12	26m13	16m47
1.0 deg	3h45	1h44	50m16	22m29	13m11	7m29
2.0 deg	55m12	25m09	12m35	7m13	4m27	3m12

Commit in [4289/branches/ORCHIDEE-MICT/ORCHIDEE]

MICT R4277 + thermosoil refactor + IOIPSL alignment (S1)

N procs	8	16	32	64	128	256	512
0.5 deg	13h42	6h28	2h59	1h28	44m14	24m48	16m35
1.0 deg	3h25	1h29	42m57	21m20	11m24	7m13
2.0 deg	45m	22m48	11m42	7m23	4m15	3m05

MICT R4277 + IOIPSL aligment (S1)

N procs	8	16	32	64	128	256	512
0.5 deg	16h39	8h46	3h	1h46(2nd try)	52m	27m14	17m19
1.0 deg	4h10	1h48(2nd try)	52m51	24m21	12m37	7m40	-
2.0 deg	55m	26m20	13m04	6m46	4m28	3m11	-

MICT R4277 + thermosoil refactor (S1)

N procs	8	16	32	64	128	256	512
0.5 deg	13h38	6h28	3h	1h29	48m16	28m52	20m20
1.0 deg	3h08	1h31	44m56	23m28	14m37	10m18
2.0 deg	49m46	25m35	14m55	10m11	7m59	6m57

Commited in [4280/branches/ORCHIDEE-MICT/ORCHIDEE]

MICT R4277 (S1)

N procs	8	16	32	64	128	256	512
0.5 deg	16h39	8h21	3h43	1h47	55m34	31m18	21m28
1.0 deg	3h27	1h48	53m37	26m21	15m38	10m46	-
2.0 deg	59m17	28m31	16m05	10m42	8m13	7m03	-

MICT R4277 + thermosoil refactor (S0)

N procs	8	16	32	64	128	256	512
0.5 deg		7h42	3h18	1h33	47m07	24m48	15m53
1.0 deg	3h27	1h36	47m	21m38	13m33	9m14
2.0 deg	51m38	24m19	14m08	8m56	5m16	4m18

Commited in [4280/branches/ORCHIDEE-MICT/ORCHIDEE]

MICT R4277 (S0)

N procs	8	16	32	64	128	256	512
0.5 deg		7h33	3h15	1h32	49m49	24m43	15m47
1.0 deg	3h26	1h36	46m05	21m18	13m25	9m05
2.0 deg	51m07	24m06	14m06	8m56	5m12	4m09

MICT R4274 (S0)

N procs	8	16	32	64	128	256	512
0.5 deg	-	7h33	3h15	1h32	46m49	24m43	15m47
1.0 deg	3h26	1h36	46m05	21m18	13m25	9m05
2.0 deg	51m07	24m06	14m04	8m56	5m12	4m09

Trunk R3934 (XIOS 2 + S0)

N procs	8	16	32	64	128	256
0.5 deg	3h23	2h01	1h19	1h01	53m18	48m40
1.0 deg	52m07	32m10	21m38	17m18	14m52	13m56
2.0 deg	14m50	9m11	6m38	5m39	5m15	5m13

Notes:

• Interpolation is sequential

Mict R3932 (XIOS 2) + CROP + IOIPSL restarts

This is an early test with IOIPSL + restarts to 3, 4 and 5 dimensions. This revision is still in a perso directory. It includes remaining revisions from TRUNK. It will be merge to the main MICT branch any time soon.

Its purpose is to provide a first draft of this modification.

N procs	8	16	32	64	128	256
0.5 deg	15h54	7h50	3h42	2h06	55m01	34m35

• 0.5: The number of XIOS outputs is reduced so the simulation can finish.

Mict R3932 (XIOS 2) + IOIPSL restarts

This is an early test with IOIPSL + restarts to 3, 4 and 5 dimensions. This revision is still in a perso directory. It includes remaining revisions from TRUNK. It will be merge to the main MICT branch any time soon.

Its purpose is to provide a first draft of this modification.

N procs	8	16	32	64	128	256
0.5 deg	Out of mem.	5h31	2h40	1h24	44m32	23m15
1 deg	2h44	1h21	39m24	19m15	10m44	7m21
2 deg	43m41	20m37	10m58	6m23	4m15	3m24

• 0.5: The number of XIOS outputs is reduced so the simulation can finish.

Mict R3811 (XIOS 2)

N procs	8	16	32	64	128	256
0.5 deg	out of memory	out of memory	out of memory	out of memory	1h33	1h27
1 deg	2h48	1h27	44m24	25m21	19m52	13m47
2 deg	43m48	21m31	11m13	7m40	5m16	4m30

Output Netcdf files:

• 0.5 Degree

Filename	Size	# vars
stomate_rest_out.nc	14G	379 (double)
sechiba_rest_out.nc	8.5G	234 (double)
driver_rest_out.nc	28M	13 (double)
sechiba_history.nc	3.0G	114 (float)
stomate_history.nc	3.3G	297 (float)

Changes

• CROP restart variables are now only active when CROP is enabled.
• XIOS history outputs now include 4D/5D dimension. It allows to reduce the number of variables in the outputs.

Issues

• 0.5 deg Out of memory is due to XIOS

Conclusion

• 0.5deg - 64 procs: it might be due to 4D/5D variables.
• 0.5deg computing time: less restart variables to write decreased total time. CROP module still has this problem.

Mict R3791 (XIOS 2)

• Date: 30/09/16
• Add all XIOS output fields

Time table:

N procs	8	16	32	64	128	256
0.5 deg	out of memory	out of memory	out of memory	14h56	15h42	11h06
1 deg	3h19	2h28	1h52	2h22	1h32	1h23
2 deg	54m38	38m53	23m58	24m43	24m37	16m11

Output Netcdf files:

• 0.5 Degree

Filename	Size	# vars
stomate_rest_out.nc	20G	611 (double)
sechiba_rest_out.nc	8.6G	234 (double)
driver_rest_out.nc	28M	13 (double)
sechiba_history.nc	2.0G	388 (float)
stomate_history.nc	3.8G	1179 (float)

Changes

• Add CROP module.

Issues

• 0.5 deg Memory requirements are high
• 0.5 deg Simulation Time is far too high. Even when the module is disabled.

Conclusion

• 0.5deg Memory: the introduction of XIOS increases the memory usage
• 0.5deg simulation time: a lots of more restart variables to write

Mict R3587 (XIOS 2!)

• Small fixes
• Trunk update

Time table:

N procs	8	16	32	64	128	256
0.5 deg	out of memory	4h43	2h21	1h18	58	47
1 deg	running	1h05	35	23	16	18
2 deg	-	-	-	-	-	-

Mict R3587 (XIOS 2 + thermosoil_cond_pft)

This specific branch involves the subroutine thermosoil_cond_pft. It is shown in some profiling reports to be highly consuming. The next tests are an effort to improve the performance.

All tests are done with 0.5 degres. All other parameters are the same specified in this section.

N procs	32	64	128	256
Avx + align 32 + vecalign32	2h08	1h16	49	40
Align 32 + vecalign32	2h13	1h30	54	43
Avx + align 32	2h12	1h18	1h02	47
Align 16	2h23	1h13	1h04	50

Description:

• avx: 256 bit register
• align 32: -align array32byte compilation flag
• align 16: -align array16byte compilation flag
• vecalign: source code lines to help the compiler improve the performance

Mict R3567

• New driver

Time table:

N procs	8	16	32	64	128	256
0.5 deg	timeout	11h22	7h21	4h51	3h38	2h49
1 deg	4h22	2h21	1h24	54	39	30
2 deg	58	31	19	13	9	7

Mict R3527

• PFT parallel interpolation

Time table:

N procs	8	16	32	64	128	256
0.5 deg	>16h39 322 days	11h09	7h06	4h50	3h31	2h47
1 deg	4h10	2h14	1h20	52	37	30
2 deg	55m05	30m01	18m05	12	9	7

Mict R3161

Time table:

N procs	4	8	16	32	64	128
0.5 deg	timeout	timeout	13h00	8h46	6h35	5h38
1 deg	6h37	4h20	2h36	1h45	1h21	1h08
2 deg	1h40	56	35	24	19	16

Note: 0.5 deg in 4 N procs did not start due to memory requirements. 0.5 deg in 8 N procs could not finish the simulation in the maximum time given by the HPC. It stopped at the simulation day 322. Both values can be extrapolated.

Trunk R2916

The same simulations with the same options where carried out with the following results:

N procs	4	8	16	32	64	128
0.5 deg	8h38	5h31	3h26	2h23	1h48	1h31
1 deg	2h07	1h17	47	32	25	21
2 deg	38	19	11	8	6	5

IOIPSL

Restart File Creation :