[erlang-questions] Problem: ll_alloc: Cannot reallocate 10830000 bytes of memory (of type "driver_event_state").

[Sverker Eriksson]

This is a current shortcoming of the halfword emulator.

In halfword emulator some memory must be allocated within the first 4Gb ("low" memory) and other allocations can use any memory. However, in R14B02, not all allocations that could use "high" memory does so. "driver_event_state" is an example of such memory that could make use of high memory but doesn't. I will try to fix that for R14B03.

/Sverker, Erlang/OTP, Ericsson


yaohui wrote:
> we want a tcp server that can accpet 500k concurrent connections, the server run on 64bit linux with 16G memory, each client send a message per 30s, the server receive message and nothing to do. but reach about 450k connections, the server crashed,
>  Crash dump was written to: erl_crash.dump
> ll_alloc: Cannot reallocate 10830000 bytes of memory (of type "driver_event_state").
> Aborted
>   
>  here is a part of erl_crash.dump
>  =erl_crash_dump:0.1
> Wed Apr  6 19:02:29 2011
> Slogan: ll_alloc: Cannot reallocate 10888824 bytes of memory (of type "driver_event_state").
> System version: Erlang R14B02 (erts-5.8.3) [source] [64-bit halfword] [smp:8:8] [rq:8] [async-threads:0] [kernel-poll:true]
> Compiled: Wed Apr  6 09:44:31 2011
> Taints: 
> Atoms: 6628
> =memory
> total: 2056754272
> processes: 749739128
> processes_used: 749736512
> system: 1307015144
> atom: 462593
> atom_used: 437166
> binary: 685882200
> code: 3536547
> ets: 195800
>   
>  =allocated_areas
> sys_misc: 55011874
> static: 222822400
> atom_space: 98328 73381
> atom_table: 95961
> module_table: 9084
> export_table: 50316
> register_table: 276
> fun_table: 3266
> module_refs: 2048
> loaded_code: 3166041
> dist_table: 523
> node_table: 219
> bits_bufs_size: 0
> bif_timer: 80184
> link_lh: 0
> proc: 275970288 275969680
> atom_entry: 268304 267824
> export_entry: 262256 261776
> module_entry: 8088 7688
> reg_proc: 1664 904
> monitor_sh: 1176 168
> nlink_sh: 36651736 36651496
> fun_entry: 37696 36328
> driver_event_data_state: 48 48
> db_tab: 5976 5384
> driver_select_data_state: 11067400 11066992
> =allocator:sys_alloc
> option e: true
> option m: libc
> option tt: 131072
> option tp: 0
>   
>  anynoe can analyze this error? 
>  thx
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