On 5/19/05, Gennadiy Rozental <gennadiy.rozental@thomson.com> wrote:
4. What kind of overhead it introduces? Now instead of directly writing into stream we keep second copy of every piece of log essentially doubling the memory usage and increasing log overhead, isn't it?
Have you actually tested it in a multi-threading environment, or is this just your guts?
How MT is related to my question? You introduces extra buffering level. I am asking how efficient it is.
There should be no doubling of messages, though they are copied from one place to another. Generally messages are formatted in a temporary ostringstream and then written to files or other sinks via appender functions. user code -> ostringstream -> modifier functions (if any) -> appenders There is a special appender called ts_appender that buffers formatted messages in a string until the time arrives to flush them to their ultimate destination. user code -> ostringstream -> modifier functions (if any) -> string buffer [background thread]: string buffer -> appenders -- Caleb Epstein caleb dot epstein at gmail dot com