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--- crosscheck [2023/07/16 14:56] – [The full cross-check in progress] mino
+++ crosscheck [Unknown date] (current) – removed - external edit (Unknown date) 127.0.0.1
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-==== A moderate cross-check done already ======
-Computing resources available in clouds are diverse in their performance, price and lifetime. To save cost, I had to continuously seek inexpensive resources and create instances in daily basis. The total number of instances ever created exceeded five hundreds. I did the following as a minimal verification of the resouces:
-  * Every time a new instance created a benchmark program which counts a small subset was executed and the time and the result was recorded. If the answer was wrong, that resource was never used. I actually saw a few such resources and it is noteworthy that some versions of docker environment with multiple RTX-4090s produced wrong answers due to a failure of inter-GPU atomic transactions. I avoided multiple 4090s working together and used them separately instead.
-  * As a postmortem verification, independent re-counting have been done for every instance at a sampling rate of once per day. If any wrong results were found, all results that resource produced were considered unreliable.
-==== The full cross-check in progress ====
-If every subtotal is calculated twice and the two results match, the counts should be considered correct (provided the code is correct). The re-counting is in progress and is done up to 6.5% as of 2023/07/15.