Floating point exception

[drewhemm]

Hi,

I have compiled this and attempted to run it on a server, but I get the following:

# ./hdrdmacp -s
Looking for IB devices ...

=============================================
Found 1 devices
---------------------------------------------
   device 0 : mlx4_0 : uverbs0 : IB : InfiniBand channel adapter : Num. ports=2 : port num=1 : lid=1
=============================================

Device mlx4_0 opened. num_comp_vectors=96
Port attributes:
           state: 4
         max_mtu: 5
      active_mtu: 5
  port_cap_flags: 38865000
      max_msg_sz: 1073741824
    active_width: 2
    active_speed: 4
      phys_state: 5
      link_layer: 1
Floating point exception

Any ideas what could be wrong? I have searched in the source code and float is not explicitly used. I'll continue to have a look to see if I can spot where the problem is.

[drewhemm]

Went through the code line-by-line and found the problem here:

https://github.com/JeffersonLab/hdrdmacp/blob/master/hdRDMA.cc#L143

buff_section_len = (buff_len_GB*1000000000)/(uint64_t)num_buff_sections;

Basically, the -n and -m flags are required for the server, not optional:

$ hdrdmacp -s -n 4 -m 8GB
Looking for IB devices ...

=============================================
Found 1 devices
---------------------------------------------
   device 0 : mlx4_0 : uverbs0 : IB : InfiniBand channel adapter : Num. ports=2 : port num=1 : lid=2
=============================================

Device mlx4_0 opened. num_comp_vectors=32
Port attributes:
           state: 4
         max_mtu: 5
      active_mtu: 5
  port_cap_flags: 38865002
      max_msg_sz: 1073741824
    active_width: 2
    active_speed: 4
      phys_state: 5
      link_layer: 1
Created 4 buffers of 2000MB (8GB total)
Listening for connections on port ... 10470

[GalaxyBangBang]

Thank you very much.