diff --git a/bench.sh b/bench.sh
index c3b95e6..66d9e7b 100755
--- a/bench.sh
+++ b/bench.sh
@@ -6,7 +6,7 @@ FMNT=/media/test
 BMNT=/media/bench
 mkdir -p "$FMNT"
 mkdir -p "$BMNT"
-./fuseuring /tmp/backing_file.img "$FMNT" $((500*1024*1024)) 5000 &
+./fuseuring /tmp/backing_file.img "$FMNT" $((500*1024*1024)) 100 5000 4 &
 while ! test -e "$FMNT/volume"; do sleep 1; done
 LODEV=$(losetup --find --show "$FMNT/volume" --direct-io=on)
 mkfs.ext4 -F $LODEV
diff --git a/fuse_io_context.cpp b/fuse_io_context.cpp
index 6d4a608..09b44a0 100755
--- a/fuse_io_context.cpp
+++ b/fuse_io_context.cpp
@@ -4,7 +4,7 @@
 #include <liburing.h>
 #include <iostream>
 
-fuse_io_context::MallocItem* fuse_io_context::malloc_cache_head = nullptr;
+thread_local fuse_io_context::MallocItem* fuse_io_context::malloc_cache_head = nullptr;
 
 fuse_io_context::fuse_io_context(FuseRing fuse_ring)
  : fuse_ring(std::move(fuse_ring)), last_rc(0)
diff --git a/fuse_io_context.h b/fuse_io_context.h
index 3750472..f923d87 100755
--- a/fuse_io_context.h
+++ b/fuse_io_context.h
@@ -187,7 +187,7 @@ struct fuse_io_context
         char data[];
     };
 
-    static MallocItem* malloc_cache_head;
+    thread_local static MallocItem* malloc_cache_head;
     static constexpr size_t malloc_cache_item_size = 500;
 
     static void clear_malloc_cache()
diff --git a/fuseuring_main.cpp b/fuseuring_main.cpp
index c95cfdf..2a1ee36 100755
--- a/fuseuring_main.cpp
+++ b/fuseuring_main.cpp
@@ -14,6 +14,7 @@
 #include <thread>
 #include <iostream>
 #include "fuse_io_context.h"
+#include "fuseuring_main.h"
 
 namespace
 {
@@ -382,7 +383,7 @@ namespace
 
     io_uring_prep_splice(sqe3, fuse_io->pipe[0],
         -1, io.fuse_ring.fd, -1, out_header->len,
-        SPLICE_F_FD_IN_FIXED | SPLICE_F_NONBLOCK);
+        SPLICE_F_MOVE | SPLICE_F_FD_IN_FIXED | SPLICE_F_NONBLOCK);
     sqe3->flags |= IOSQE_FIXED_FILE;
     
     std::vector<int> rcs = co_await io.complete({sqe1, sqe2, sqe3});
@@ -797,7 +798,8 @@ fuse_io_context::io_uring_task<int> queue_fuse_read(fuse_io_context& io)
     co_return rc;
 }
 
-int fuseuring_main(int backing_fd, const std::string& mountpoint, int max_background, int congestion_threshold)
+int fuseuring_main(int backing_fd, const std::string& mountpoint, int max_fuse_ios, 
+    int max_background, int congestion_threshold, size_t n_threads)
 {
     umount(mountpoint.c_str());
 
@@ -923,7 +925,8 @@ int fuseuring_main(int backing_fd, const std::string& mountpoint, int max_backgr
     init_out.init_out.congestion_threshold = congestion_threshold;
     init_out.init_out.max_pages = static_cast<uint16_t>(fuse_max_pages);
     init_out.init_out.time_gran = 1;
-    init_out.init_out.max_write = getpagesize()*fuse_max_pages;
+    size_t max_write = getpagesize()*fuse_max_pages;
+    init_out.init_out.max_write = max_write;
     
     if(write(fuse_fd, &init_out, sizeof(init_out))!=sizeof(init_out))
     {
@@ -931,14 +934,86 @@ int fuseuring_main(int backing_fd, const std::string& mountpoint, int max_backgr
         return 9;
     }
 
-    struct io_uring fuse_uring;
-
-    rc = io_uring_queue_init(max_background*2, &fuse_uring, 0);//IORING_SETUP_SQPOLL);
-
-    if(rc<0)
+    if(n_threads<=1)
     {
-        perror("Error setting up io_uring.");
-        return 10;
+        return fuseuring_run(max_background, max_write, backing_fd, fuse_fd, nullptr, 0);
+    }
+    else
+    {
+        struct io_uring fuse_uring;
+
+        int rc = io_uring_queue_init(std::max(100, max_fuse_ios*2), &fuse_uring, 0);
+
+        if(rc<0)
+        {
+            perror("Error setting up io_uring.");
+            return 10;
+        }
+
+        int thread_rc=0;
+        std::vector<std::thread> threads;
+        for(size_t i=0;i<n_threads;++i)
+        {
+            threads.push_back(std::thread( [max_fuse_ios, 
+                    max_write, backing_fd, fuse_fd, &thread_rc, i, &fuse_uring] () {
+
+                int session_fd = open("/dev/fuse", O_RDWR | O_CLOEXEC);
+                if(session_fd==-1)
+                {
+                    perror("Error opening /dev/fuse -2.");
+                    thread_rc=2;
+                    return;
+                }
+
+                int rc = ioctl(session_fd, FUSE_DEV_IOC_CLONE, &fuse_fd);
+                if(rc==-1)
+                {
+                    perror("Error cloning fuse fd");
+                    thread_rc=3;
+                }
+
+                rc = fuseuring_run(max_fuse_ios, 
+                        max_write, backing_fd, session_fd,
+                        i==0 ? &fuse_uring : nullptr,
+                        i==0 ? 0 : fuse_uring.ring_fd);
+                if(rc!=0)
+                    thread_rc=rc;
+            }));
+        }
+
+        for(auto& thread: threads)        
+        {
+            thread.join();
+        }
+        return thread_rc;
+    }
+}
+
+int fuseuring_run(int max_fuse_ios, size_t max_write, 
+    int backing_fd, int fuse_fd, struct io_uring* fuse_uring, int uring_wq_fd)
+{
+    struct io_uring fuse_uring_local;
+
+    if(fuse_uring==nullptr)
+    {
+        struct io_uring_params p = {};
+
+        //p.flags = IORING_SETUP_SQPOLL;
+        if(uring_wq_fd!=0)
+        {
+            p.flags = IORING_SETUP_ATTACH_WQ;
+        }
+        p.wq_fd = uring_wq_fd;
+
+        int rc = io_uring_queue_init_params(std::max(100, max_fuse_ios*2), &fuse_uring_local, &p);//IORING_SETUP_SQPOLL);
+
+        if(rc<0)
+        {
+            perror("Error setting up io_uring.");
+            return 10;
+        }
+
+        fuse_uring = &fuse_uring_local;
     }
     
     std::vector<int> fixed_fds;
@@ -952,9 +1027,9 @@ int fuseuring_main(int backing_fd, const std::string& mountpoint, int max_backgr
     fixed_fds.push_back(backing_fd);
     fuse_ring.backing_fd_orig = backing_fd;
 
-    size_t max_bufsize = init_out.init_out.max_write + sizeof(fuse_in_header) + sizeof(fuse_write_in);
+    size_t max_bufsize = max_write + sizeof(fuse_in_header) + sizeof(fuse_write_in);
 
-    std::vector<char> header_buf_v(header_buf_size*init_out.init_out.max_background);
+    std::vector<char> header_buf_v(header_buf_size*max_fuse_ios);
     char* header_buf = header_buf_v.data();
 
     struct iovec iov;
@@ -963,7 +1038,7 @@ int fuseuring_main(int backing_fd, const std::string& mountpoint, int max_backgr
     size_t header_buf_idx = reg_buffers.size();
     reg_buffers.push_back(iov);
 
-    std::vector<char> scratch_buf_v(scratch_buf_size*init_out.init_out.max_background);
+    std::vector<char> scratch_buf_v(scratch_buf_size*max_fuse_ios);
     char* scratch_buf = scratch_buf_v.data();
     iov.iov_base = scratch_buf;
     iov.iov_len = scratch_buf_v.size();
@@ -972,10 +1047,10 @@ int fuseuring_main(int backing_fd, const std::string& mountpoint, int max_backgr
 
     std::vector<int> pipe_fds;
 
-    for(size_t i=0;i<init_out.init_out.max_background;++i)
+    for(size_t i=0;i<max_fuse_ios;++i)
     {
         std::unique_ptr<fuse_io_context::FuseIo> new_io = std::make_unique<fuse_io_context::FuseIo>();
-        rc = pipe2(new_io->pipe, O_CLOEXEC|O_NONBLOCK);
+        int rc = pipe2(new_io->pipe, O_CLOEXEC|O_NONBLOCK);
         if(rc!=0)
         {
             perror("Error creating pipe.");
@@ -1008,21 +1083,21 @@ int fuseuring_main(int backing_fd, const std::string& mountpoint, int max_backgr
         fuse_ring.ios.push_back(std::move(new_io));
     }
 
-    rc = io_uring_register_files(&fuse_uring, &fixed_fds[0], fixed_fds.size());
+    int rc = io_uring_register_files(fuse_uring, &fixed_fds[0], fixed_fds.size());
     if(rc<0)
     {
         perror("Error registering fuse io_uring files.");
         return 13;
     }
 
-    rc = io_uring_register_buffers(&fuse_uring, &reg_buffers[0], reg_buffers.size());
+    rc = io_uring_register_buffers(fuse_uring, &reg_buffers[0], reg_buffers.size());
     if(rc<0)
     {
         perror("Error registering fuse io_uring buffers.");
         return 14;
     }
     
-    fuse_ring.ring = &fuse_uring;
+    fuse_ring.ring = fuse_uring;
     fuse_ring.ring_submit = false;
     fuse_ring.max_bufsize = max_bufsize;
 
@@ -1039,10 +1114,10 @@ int fuseuring_main(int backing_fd, const std::string& mountpoint, int max_backgr
     fuse_io_context service(std::move(fuse_ring));
     rc = service.run(queue_fuse_read);
 
-    io_uring_unregister_buffers(&fuse_uring);
-    io_uring_unregister_files(&fuse_uring);
+    io_uring_unregister_buffers(fuse_uring);
+    io_uring_unregister_files(fuse_uring);
 
-    io_uring_queue_exit(&fuse_uring);
+    io_uring_queue_exit(fuse_uring);
 
     for(int p: pipe_fds)
     {
diff --git a/fuseuring_main.h b/fuseuring_main.h
index 4862f73..a7aa5c6 100755
--- a/fuseuring_main.h
+++ b/fuseuring_main.h
@@ -3,4 +3,9 @@
 #pragma once
 #include <string>
 
-int fuseuring_main(int backing_fd, const std::string& mountpoint, int max_background, int congestion_threshold);
\ No newline at end of file
+int fuseuring_main(int backing_fd, const std::string& mountpoint, int max_fuse_ios, 
+    int max_background, int congestion_threshold, size_t n_threads);
+
+struct fuse_uring;
+int fuseuring_run(int max_fuse_ios, size_t max_write, int backing_fd, 
+    int fuse_fd, struct io_uring* fuse_uring, int uring_wq_fd);
\ No newline at end of file
diff --git a/main.cpp b/main.cpp
index 6fa5690..55b13d8 100755
--- a/main.cpp
+++ b/main.cpp
@@ -18,9 +18,9 @@
 
 int main(int argc, char* argv[])
 {
-    if(argc<5)
+    if(argc<6)
     {
-        std::cerr << "Not enough arguments ./fuseuring [backing file path] [fuse mount path] [backing file size] [fuse max_background]" << std::endl;
+        std::cerr << "Not enough arguments ./fuseuring [backing file path] [fuse mount path] [backing file size] [fuse max ios] [fuse max_background] [number of threads]" << std::endl;
         return 101;
     }
 
@@ -58,9 +58,12 @@ int main(int argc, char* argv[])
         perror("Error increasing RLIMIT_MEMLOCK");
     }
 
-    int fuse_max_background = atoi(argv[4]);
+    int fuse_max_ios = atoi(argv[4]);
+    int fuse_max_background = atoi(argv[5]);
+    size_t n_threads = static_cast<size_t>(atoi(argv[6]));
 
-    rc = fuseuring_main(backing_fd, argv[2], fuse_max_background, fuse_max_background+1000);
+    rc = fuseuring_main(backing_fd, argv[2], fuse_max_ios, 
+        fuse_max_background, fuse_max_background+1000, n_threads);
 
     close(backing_fd);
 
diff --git a/readme.md b/readme.md
index fd7b455..22b6595 100644
--- a/readme.md
+++ b/readme.md
@@ -140,7 +140,7 @@ FMNT=/media/test
 BMNT=/media/bench
 mkdir -p "$FMNT"
 mkdir -p "$BMNT"
-./fuseuring /tmp/backing_file.img "$FMNT" $((500*1024*1024)) 5000 &
+./fuseuring /tmp/backing_file.img "$FMNT" $((500*1024*1024)) 200 5000 1 &
 LODEV=$(losetup --find --show "$FMNT/volume" --direct-io=on)
 mkfs.ext4 $LODEV || true
 mount $LODEV "$BMNT"