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vulkan_decode: adjust number of async contexts created

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This caps the number of contexts we create based on thread count.
This saves VRAM and filters out cases where more async is of lesser
benefit.
This commit is contained in:
Lynne
2025-03-07 21:07:41 +00:00
parent 4495802bdb
commit e15e85b869
1 changed files with 8 additions and 2 deletions
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10
libavcodec/vulkan_decode.c
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@ -1122,6 +1122,7 @@ int ff_vk_decode_init(AVCodecContext *avctx)
FFVulkanDecodeShared *ctx;
FFVulkanContext *s;
FFVulkanFunctions *vk;
int async_depth;
const VkVideoProfileInfoKHR *profile;
const FFVulkanDecodeDescriptor *vk_desc;
const VkPhysicalDeviceDriverProperties *driver_props;
@ -1191,9 +1192,14 @@ int ff_vk_decode_init(AVCodecContext *avctx)
/* Create decode exec context for this specific main thread.
* 2 async contexts per thread was experimentally determined to be optimal
* for a majority of streams. */
async_depth = 2*ctx->qf->num;
/* We don't need more than 2 per thread context */
async_depth = FFMIN(async_depth, 2*avctx->thread_count);
/* Make sure there are enough async contexts for each thread */
async_depth = FFMAX(async_depth, avctx->thread_count);
err = ff_vk_exec_pool_init(s, ctx->qf, &ctx->exec_pool,
FFMAX(2*ctx->qf->num, avctx->thread_count),
0, 0, 0, profile);
async_depth, 0, 0, 0, profile);
if (err < 0)
goto fail;