[yt-users] Rockstar and RAMSES (DM only run). Rockstar appears to run, but no halo information is written.

[Ben Thompson]

P.S sorry if I sent the same email twice.. this is the actual email...
accidental press send before I sent the email out.

Hello everyone.

I am currently using YT to run rockstar on my simulation.

I have been following the instructions which are around and about and have
managed to write a script to run rockstar via MPI

readers = int(ncpu/4.)
#Reserve one cpu for the server
writers = ncpu - readers - 1
print 'Running rockstar with %i writers and %i readers'%(writers, readers)
rh = RockstarHaloFinder(es, num_readers=readers, num_writers=writers,
                        particle_type="dark_matter", dm_only=True)
rh.run()

using a particle filter on the datasets

@yt.particle_filter("dark_matter", requires=[('particle_mass')])
def dark_matter(pfilter, data):
        if ('all', 'particle_age') in data.ds.field_list:
                return data[("all", "particle_age")] == 0.0
        else:
                arr = np.zeros(len(data['particle_mass']))
                return arr == 0.0

def setup_ds(ds):
        #Return only dark matter particles, and assert that the filter holds
        print 'Here'
        assert(ds.add_particle_filter("dark_matter"))


It seems to run fine.... e.g


[   111s] Sending projection requests...
[   112s] Transferring particles to writers...
[   116s] Analyzing for FoF groups...
[   116s] Transferring boundary particles between writers...
[   117s] Linking boundary particles...
[   117s] Analyzing for halos / subhalos...
[   119s] Loading merger tree information...
[   120s] Constructing merger tree...
[   121s] [Success] Done with snapshot 7.
[   121s] Reading 6 blocks for snapshot 8...
P001 yt : [INFO     ] 2014-10-03 16:19:28,101 Loading field plugins.
P002 yt : [INFO     ] 2014-10-03 16:19:28,101 Loading field plugins.
P001 yt : [INFO     ] 2014-10-03 16:19:28,101 Loaded angular_momentum (8
new fields)
P001 yt : [INFO     ] 2014-10-03 16:19:28,101 Loaded astro (14 new fields)
P001 yt : [INFO     ] 2014-10-03 16:19:28,102 Loaded cosmology (20 new
fields)
P001 yt : [INFO     ] 2014-10-03 16:19:28,102 Loaded fluid (56 new fields)
P001 yt : [INFO     ] 2014-10-03 16:19:28,103 Loaded fluid_vector (88 new
fields)
P001 yt : [INFO     ] 2014-10-03 16:19:28,103 Loaded geometric (102 new
fields)
P001 yt : [INFO     ] 2014-10-03 16:19:28,103 Loaded local (102 new fields)
P001 yt : [INFO     ] 2014-10-03 16:19:28,104 Loaded magnetic_field (108
new fields)
P001 yt : [INFO     ] 2014-10-03 16:19:28,104 Loaded species (108 new
fields)
P006 yt : [INFO     ] 2014-10-03 16:19:28,127 Loading field plugins.
P005 yt : [INFO     ] 2014-10-03 16:19:28,128 Loading field plugins.
P003 yt : [INFO     ] 2014-10-03 16:19:28,128 Loading field plugins.
P004 yt : [INFO     ] 2014-10-03 16:19:28,135 Loading field plugins.
[   129s] Sending projection requests...
[   130s] Transferring particles to writers...
[   132s] Analyzing for FoF groups...
[   133s] Transferring boundary particles between writers...
[   133s] Linking boundary particles...
[   134s] Analyzing for halos / subhalos...
[   137s] Loading merger tree information...
[   138s] Constructing merger tree...
[   139s] [Success] Done with snapshot 8.
[   139s] Reading 6 blocks for snapshot 9...
[   143s] Sending projection requests...
[   144s] Transferring particles to writers...
[   146s] Analyzing for FoF groups...
[   147s] Transferring boundary particles between writers...
[   147s] Linking boundary particles...
[   148s] Analyzing for halos / subhalos...
[   150s] Loading merger tree information...
[   151s] Constructing merger tree...
[   152s] Constructing merger tree...
[   153s] [Success] Done with snapshot 9.
[   153s] [Finished]

generates the outputs


halos_0.0.ascii    halos_1.14.bin    halos_2.4.ascii   halos_3.9.bin
halos_5.14.ascii  halos_6.3.bin     halos_7.9.ascii   halos_9.13.bin
halos_0.0.bin      halos_1.15.ascii  halos_2.4.bin     halos_4.0.ascii
halos_5.14.bin    halos_6.4.ascii   halos_7.9.bin     halos_9.14.ascii
halos_0.10.ascii   halos_1.15.bin    halos_2.5.ascii   halos_4.0.bin
halos_5.15.ascii  halos_6.4.bin     halos_8.0.ascii   halos_9.14.bin
halos_0.10.bin     halos_1.16.ascii  halos_2.5.bin     halos_4.10.ascii
halos_5.15.bin    halos_6.5.ascii   halos_8.0.bin     halos_9.15.ascii
halos_0.11.ascii   halos_1.16.bin    halos_2.6.ascii   halos_4.10.bin
halos_5.16.ascii  halos_6.5.bin     halos_8.10.ascii  halos_9.15.bin


but they are all empty.... yet within profiling, it seems to imply that
there were some particles submitted to be analised


[Prof] S0,C0 0s: 10191 fofs, 123365 particles, 0s for conf.
[Prof] S0,C0: 0p,0h,0w; wt:0s; rcv:0s,0s; snd:0s; wk:0s; idl:1s
[Prof] S1,C0 0s: 10377 fofs, 123363 particles, 0s for conf.
[Prof] S1,C0: 1814p,73h,1w; wt:1s; rcv:0s,0s; snd:0s; wk:0s; idl:1s
[Prof] S2,C0 0s: 9843 fofs, 123353 particles, 0s for conf.
[Prof] S2,C0: 5115p,139h,1w; wt:1s; rcv:0s,0s; snd:0s; wk:0s; idl:1s
[Prof] S3,C0 0s: 9616 fofs, 123359 particles, 0s for conf.
[Prof] S3,C0: 9637p,221h,1w; wt:1s; rcv:0s,0s; snd:0s; wk:0s; idl:1s
[Prof] S4,C0 1s: 9256 fofs, 123367 particles, 0s for conf.
[Prof] S4,C0: 14849p,314h,1w; wt:0s; rcv:0s,1s; snd:0s; wk:0s; idl:0s
[Prof] S5,C0 0s: 9233 fofs, 123361 particles, 0s for conf.
[Prof] S5,C0: 17771p,369h,1w; wt:0s; rcv:0s,0s; snd:1s; wk:0s; idl:0s
[Prof] S6,C0 0s: 8964 fofs, 123365 particles, 0s for conf.
[Prof] S6,C0: 19888p,388h,1w; wt:0s; rcv:0s,1s; snd:0s; wk:0s; idl:0s
[Prof] S7,C0 0s: 8996 fofs, 123356 particles, 0s for conf.
[Prof] S7,C0: 22352p,426h,1w; wt:0s; rcv:0s,1s; snd:0s; wk:0s; idl:1s
[Prof] S8,C0 0s: 8801 fofs, 123361 particles, 0s for conf.
[Prof] S8,C0: 22553p,441h,1w; wt:0s; rcv:0s,1s; snd:0s; wk:0s; idl:1s
[Prof] S9,C0 1s: 8806 fofs, 123361 particles, 0s for conf.
[Prof] S9,C0: 22685p,440h,1w; wt:0s; rcv:0s,1s; snd:0s; wk:0s; idl:1s


Is there anything I should consider looking at to debug this problem? Any
suggestions of what to look at?

Thanks

Ben
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