GraphLab does not run when there is only 1 core about powergraph HOT 4 OPEN

Closed by #43

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Hmm. There is still one more location that has to be fixed.

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(sorry accidentally deleted this...)

Additional input. I am getting a similar error even when there are 2 nodes, when runniing LDA
using the command:
./cgs_lda --corpus filename --dictionary filename2 --ncpus 8 --ntopics 50 --burnin 2 --alpha 1.0 --beta 0.1 --topk 20 --doc_dir doc_count_K50 --word_dir word_count_K50 --engine=synchronous --interval=5

Running The Collapsed Gibbs Sampler
INFO: synchronous_engine.hpp(start:1299): Iteration counter will only output every 5 seconds.
INFO: synchronous_engine.hpp(start:1314): 0: Starting iteration: 0
ERROR: fiber_control.cpp(launch:234): Check failed: b<nworkers [2 < 2]
[ip-172-31-25-110:28404] *** Process received signal ***
[ip-172-31-25-110:28404] Signal: Aborted (6)
[ip-172-31-25-110:28404] Signal code: (-6)
[ip-172-31-25-110:28404] [ 0] /lib/x86_64-linux-gnu/libpthread.so.0(+0xfcb0) [0x7f22605e0cb0]
[ip-172-31-25-110:28404] [ 1] /lib/x86_64-linux-gnu/libc.so.6(gsignal+0x35) [0x7f225ef3e425]
[ip-172-31-25-110:28404] [ 2] /lib/x86_64-linux-gnu/libc.so.6(abort+0x17b) [0x7f225ef41b8b]
[ip-172-31-25-110:28404] [ 3] ./cgs_lda(_ZN8graphlab13fiber_control6launchEN5boost8functionIFvvEEEmNS_18fixed_dense_bitsetILi64EEE+0x47) [0x59cd57]
[ip-172-31-25-110:28404] [ 4] ./cgs_lda(_ZN8graphlab11fiber_group6launchERKN5boost8functionIFvvEEENS_18fixed_dense_bitsetILi64EEE+0x3d5) [0x5a0d55]
[ip-172-31-25-110:28404] [ 5] ./cgs_lda(ZN8graphlab18synchronous_engineI22cgs_lda_vertex_programE15run_synchronousIMS2_FvmEEEvT+0x6fb) [0x561dcb]
[ip-172-31-25-110:28404] [ 6] ./cgs_lda(_ZN8graphlab18synchronous_engineI22cgs_lda_vertex_programE5startEv+0x21e) [0x58625e]
[ip-172-31-25-110:28404] [ 7] ./cgs_lda(main+0x1701) [0x4ba751]
[ip-172-31-25-110:28404] [ 8] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xed) [0x7f225ef2976d]
[ip-172-31-25-110:28404] [ 9] ./cgs_lda() [0x4bd099]
[ip-172-31-25-110:28404] *** End of error message ***
Aborted (core dumped)

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I wonder if this issue is still not resolved ?

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