<div dir="auto">Thanks a lot Jesper!</div><div><br></div><div dir="auto">I thought about using the new counter module, by I don’t know how many counters I will have in my system. They are created dynamically </div><div dir="auto"><br></div><div dir="auto">/Frank</div><div dir="auto"><br></div><div dir="auto">wed 25 nov. 2020 à 11:33, Jesper Louis Andersen <<a href="mailto:jesper.louis.andersen@gmail.com">jesper.louis.andersen@gmail.com</a>> wrote :<br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)"><div dir="ltr"><div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">On Tue, Nov 24, 2020 at 8:33 PM Frank Muller <<a href="mailto:frank.muller.erl@gmail.com" target="_blank" style="font-family:Arial,Helvetica,sans-serif">frank.muller.erl@gmail.com</a>> wrote:</span><br></div></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)"><div dir="auto">Question: how should i set my table?<br></div><div dir="auto">1. both concurrency set to true:</div><div dir="auto">2. only read concurrency set to true:<br></div><div dir="auto">3. only write concurrency set to true:<br></div><div dir="auto"><br></div><div dir="auto">Please explain why?</div><div dir="auto"><br></div></blockquote><div><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">4. Use the 'counters' module.</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">The caveat is that your counter set is of fixed arity and you have a way to look up an index. If both are true, they are likely to beat ETS in a measurement benchmark shootout because less locks will be taken on them. I'd measure your results.</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">The answer depends on your read/write patterns for solutions 1-3. And the CPU architecture setup, mostly in core count. It's very likely you don't get a full answer by thinking about how the locking structures are built in isolation. General rules of thumb: If mostly read, go with 2. If mostly written, go with 3. If you flip i.e., have a short window in which you mostly write and then mostly read for a while, then another write-block, ..., then go with 1.</div></div></div><div dir="ltr"><div class="gmail_quote"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div></div>-- <br><div dir="ltr">J.</div></div>
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