Relintai/pandemonium_engine
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Address slow copy performance when using the FileAccessFilesystemJAndroid implementation.

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Read/write ops for this implementation are done through the java layer via jni, and so for good performance, it's key to avoid numerous repeated small read/write ops due the jni overhead.

The alternative is to allocate a (conversatively-sized) large buffer to reduce the number of read/write ops over the jni boundary.
This commit is contained in:
Fredia Huya-Kouadio 2022-07-19 23:02:28 -04:00 committed by Relintai
parent 561314ee93
commit 361b5b23f7
1 changed files with 14 additions and 2 deletions
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16
core/os/dir_access.cpp
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@ -298,11 +298,16 @@ Error DirAccess::copy(String p_from, String p_to, int p_chmod_flags) {
return err; return err;
} }
const size_t copy_buffer_limit = 65536; // 64 KB
fsrc->seek_end(0); fsrc->seek_end(0);
int size = fsrc->get_position(); int size = fsrc->get_position();
fsrc->seek(0); fsrc->seek(0);
err = OK; err = OK;
while (size--) { size_t buffer_size = MIN(size * sizeof(uint8_t), copy_buffer_limit);
LocalVector<uint8_t> buffer;
buffer.resize(buffer_size);
while (size > 0) {
if (fsrc->get_error() != OK) { if (fsrc->get_error() != OK) {
err = fsrc->get_error(); err = fsrc->get_error();
break; break;
@ -312,7 +317,14 @@ Error DirAccess::copy(String p_from, String p_to, int p_chmod_flags) {
break; break;
} }
fdst->store_8(fsrc->get_8()); int bytes_read = fsrc->get_buffer(buffer.ptr(), buffer_size);
if (bytes_read <= 0) {
err = FAILED;
break;
}
fdst->store_buffer(buffer.ptr(), bytes_read);
size -= bytes_read;
} }
if (err == OK && p_chmod_flags != -1) { if (err == OK && p_chmod_flags != -1) {