[zeromq-dev] LMAX/Distruptor code project

[Steven McCoy]

On 6 October 2011 12:02, Francois Saint-Jacques <fsaintjacques at gmail.com>wrote:

> IMHO, considering the fact that zmq is already using pre-allocated
> arrays in yqueues and that it's a 1-producer/1-consumer scenario, I
> don't think you will get a performance boost by using the disruptor
> pattern.
>
>
The only low level details that are different would be cache line padding,
such that the following would probably help:

#define CACHE_LINE_SIZE  64

/* reader */
  chunk_t *begin_chunk;
  int begin_pos;

  char padding1__[ CACHE_LINE_SIZE - (sizeof(chunk_t*) + sizeof(int)) ];

/* writer */
  chunk_t *back_chunk;
  int back_pos;
  chunk_t *end_chunk;
  int end_pos;

  char padding2__[ CACHE_LINE_SIZE - (2 * (sizeof(chunk_t*) + sizeof(int)))
];

/* cached chunk */
  atomic_ptr_t<chunk_t> spare_chunk;

  char padding3__[ CACHE_LINE_SIZE - sizeof(atomic_ptr_t<chunk_t>) ];

Didn't Martin try this already?

-- 
Steve-o
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