zhanglistar commented on code in PR #5893:
URL: https://github.com/apache/incubator-gluten/pull/5893#discussion_r1618153459
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cpp-ch/local-engine/Common/CHUtil.cpp:
##########
@@ -672,6 +678,21 @@ void
BackendInitializerUtil::initSettings(std::map<std::string, std::string> & b
settings.set("function_json_value_return_type_allow_complex", true);
settings.set("function_json_value_return_type_allow_nullable", true);
settings.set("precise_float_parsing", true);
+ if (backend_conf_map.contains(GLUTEN_TASK_OFFHEAP))
+ {
+ auto task_memory =
std::stoull(backend_conf_map.at(GLUTEN_TASK_OFFHEAP));
+ if (!backend_conf_map.contains(CH_RUNTIME_SETTINGS_PREFIX +
"max_bytes_before_external_sort"))
+ {
+ settings.max_bytes_before_external_sort = static_cast<size_t>(0.8
* task_memory);
+ }
+ if (!backend_conf_map.contains(CH_RUNTIME_SETTINGS_PREFIX +
"prefer_external_sort_block_bytes"))
+ {
+ auto mem_gb = task_memory / static_cast<double>(1_GiB);
+ // 2.8x+5, Heuristics calculate the block size of external sort,
[8,16]
Review Comment:
Just curious, how to get this formula?
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