diff --git a/python/jittor/misc.py b/python/jittor/misc.py
index 90f426e7..46ea7cea 100644
--- a/python/jittor/misc.py
+++ b/python/jittor/misc.py
@@ -2229,10 +2229,9 @@ def histc(input, bins, min=0., max=0.):
     if bins <= 0:
         raise RuntimeError(f"bins must be > 0, but got {bins}")
     bin_length = (max - min) / bins
-    histc = jt.floor((input[jt.logical_and(input >= min, input <= max)] - min) / bin_length).int().reshape(-1)
+    histc = jt.floor((input[jt.logical_and(input >= min, input < max)] - min) / bin_length).int().reshape(-1)
     hist = jt.ones_like(histc).float().reindex_reduce("add", [bins,], ["@e0(i0)"], extras=[histc])
-    if hist.sum() != histc.shape[0]:
-        hist[-1] += 1
+    hist[-1] += input[input == max].shape[0]
     return hist
 
 def peek_s(x):
diff --git a/python/jittor/src/mem/allocator/cuda_dual_allocator.h b/python/jittor/src/mem/allocator/cuda_dual_allocator.h
index 0cc94a31..b0be66c8 100644
--- a/python/jittor/src/mem/allocator/cuda_dual_allocator.h
+++ b/python/jittor/src/mem/allocator/cuda_dual_allocator.h
@@ -30,7 +30,7 @@ EXTERN_LIB bool no_cuda_error_when_free;
 
 struct CudaDualAllocator : Allocator {
     //for recycle block_id
-    static const size_t ID_LIMIT = 1 << 16;
+    static const size_t ID_LIMIT = 1 << 20;
     int n_free_ids;
     int free_ids[ID_LIMIT];
     DualAllocation allocations[ID_LIMIT];
diff --git a/python/jittor/src/mem/allocator/sfrl_allocator.h b/python/jittor/src/mem/allocator/sfrl_allocator.h
index 2bd9a170..3d409e41 100644
--- a/python/jittor/src/mem/allocator/sfrl_allocator.h
+++ b/python/jittor/src/mem/allocator/sfrl_allocator.h
@@ -36,7 +36,7 @@ struct CachingBlockPool {
     //start from 1
     static size_t tot_block_id;           
     static std::unique_ptr<CachingBlock*[]> occupied_id_mapper;              
-    static const size_t ID_LIMIT = 1 << 18;
+    static const size_t ID_LIMIT = 1 << 21;
 
     pair<size_t,size_t> get_key(CachingBlock* block);
 
diff --git a/python/jittor/src/mem/allocator/temp_allocator.h b/python/jittor/src/mem/allocator/temp_allocator.h
index 08dc0994..ce2cd3b5 100644
--- a/python/jittor/src/mem/allocator/temp_allocator.h
+++ b/python/jittor/src/mem/allocator/temp_allocator.h
@@ -23,7 +23,7 @@ struct TempCachingBlock {
 
 struct TempAllocator : Allocator {
     static const size_t ALIGN_SIZE = 512;
-    static const size_t ID_LIMIT = 1 << 18;
+    static const size_t ID_LIMIT = 1 << 21;
     static vector<TempAllocator*> temp_allocators;
     Allocator* underlying;
     size_t cache_blocks_limit, used_memory, unused_memory;