Stinger resizes even when config->memory_size should be sufficiently large

[Edward K. Kao]

According to stinger_new_full() in stinger.c, it seems that I should be able to avoid a resize by setting config->memory_size to be large enough. However, my such attempt did not work. For example:

g = Stinger(StingerGraphs.StingerConfig(n, n*5, 1, 1, 64*10^7, 0, 0, 0)) # where n = 500

caused a resizing of the object. That surprised me because calculate_stinger_size(nv=500, nebs=2500, netypes=1, nvtypes=1) should return a size much smaller than 64*10^7. Thank you for your help!

[Eric Hein]

^ is the XOR operator in Python. ** is the exponentiation operator.

In [1]: 64*10^7
Out[1]: 647
In [2]: 64*10e7
Out[2]: 6400000000.0
In [3]: 64*10**7
Out[3]: 640000000

[Edward K. Kao]

I am doing this in Julia actually, and I verified that 64*10^7 is indeed 640000000.

[Eric Hein]

Ah OK, I guessed wrong.

I just tested creating a stinger with those same parameters in C++, and it does not trigger a resize. I suspect there is an issue with the Julia bindings, can you file an issue against that repository?

    stinger_config = (struct stinger_config_t *)xcalloc(1,sizeof(struct stinger_config_t));
    stinger_config->nv = 500;
    stinger_config->nebs = 2500;
    stinger_config->netypes = 1;
    stinger_config->nvtypes = 1;
    stinger_config->memory_size = 64 * 10e7;
    stinger_config->no_resize = 1;
    S = stinger_new_full(stinger_config);

[Edward K. Kao]

Ok, will do, thank you.

[James]

@edward-kao can you run that c++ code on your machine to see if you get a resize?

[James]

I tried to reproduce on a cluster here at GT and get the expected behavior:

julia> using StingerGraphs

julia> n=500; g = Stinger(StingerGraphs.StingerConfig(n, n*5, 1, 1, 64*10^7, 0, 0, 0))
StingerGraphs.Stinger(Ptr{Void} @0x0000000006732180)

julia> n=500; g = Stinger(StingerGraphs.StingerConfig(n, n*5, 1, 1, 64*10^3, 0, 0, 0))
stinger[82985]: stinger_new_full 827: Resizing stinger to fit into memory (detected as 64000)
StingerGraphs.Stinger(Ptr{Void} @0x0000000004d487d0)

julia> n=500; g = Stinger(StingerGraphs.StingerConfig(n, n*5, 1, 1, 64*10^8, 0, 0, 0))
StingerGraphs.Stinger(Ptr{Void} @0x0000000006899b70)

Does your machine have sufficient memory for 64e7?

[Edward K. Kao]

Turns out the resizing was happening when the graph was returned and assigned to another graph object which was not initialized with the same config setting. I fixed that and am getting the expected behavior now. Sorry about the confusion!