diff --git a/opal/mca/btl/vader/btl_vader_atomic.c b/opal/mca/btl/vader/btl_vader_atomic.c
index df3c2664be..1bf54430df 100644
--- a/opal/mca/btl/vader/btl_vader_atomic.c
+++ b/opal/mca/btl/vader/btl_vader_atomic.c
@@ -2,6 +2,7 @@
 /*
  * Copyright (c) 2010-2017 Los Alamos National Security, LLC. All rights
  *                         reserved.
+ * Copyright (c) 2019      Google, Inc. All rights reserved.
  * $COPYRIGHT$
  *
  * Additional copyrights may follow
@@ -16,58 +17,14 @@
 #include "btl_vader_endpoint.h"
 #include "btl_vader_xpmem.h"
 
-static void mca_btl_vader_sc_emu_aop_complete (mca_btl_base_module_t *btl, mca_btl_base_endpoint_t *endpoint,
-                                                mca_btl_base_descriptor_t *desc, int status)
-{
-    mca_btl_vader_frag_t *frag = (mca_btl_vader_frag_t *) desc;
-    void *local_address = frag->rdma.local_address;
-    void *context = frag->rdma.context;
-    void *cbdata = frag->rdma.cbdata;
-    mca_btl_base_rdma_completion_fn_t cbfunc = frag->rdma.cbfunc;
-
-    /* return the fragment first since the callback may call put/get/amo and could use this fragment */
-    MCA_BTL_VADER_FRAG_RETURN(frag);
-
-    cbfunc (btl, endpoint, local_address, NULL, context, cbdata, status);
-}
-
 int mca_btl_vader_emu_aop (struct mca_btl_base_module_t *btl, struct mca_btl_base_endpoint_t *endpoint,
                            uint64_t remote_address, mca_btl_base_registration_handle_t *remote_handle,
                            mca_btl_base_atomic_op_t op, uint64_t operand, int flags, int order,
                            mca_btl_base_rdma_completion_fn_t cbfunc, void *cbcontext, void *cbdata)
 {
-    mca_btl_vader_frag_t *frag;
-
-    frag = mca_btl_vader_rdma_frag_alloc (btl, endpoint, MCA_BTL_VADER_OP_ATOMIC, operand, 0, op, 0, order, flags, NULL,
-                                          remote_address, cbfunc, cbcontext, cbdata, mca_btl_vader_sc_emu_aop_complete);
-    if (OPAL_UNLIKELY(NULL == frag)) {
-        return OPAL_ERR_OUT_OF_RESOURCE;
-    }
-
-    /* send is always successful */
-    (void) mca_btl_vader_send (btl, endpoint, &frag->base, MCA_BTL_TAG_VADER);
-
-    return OPAL_SUCCESS;
-}
-
-static void mca_btl_vader_sc_emu_afop_complete (mca_btl_base_module_t *btl, mca_btl_base_endpoint_t *endpoint,
-                                                mca_btl_base_descriptor_t *desc, int status)
-{
-    mca_btl_vader_frag_t *frag = (mca_btl_vader_frag_t *) desc;
-    mca_btl_vader_sc_emu_hdr_t *hdr;
-    void *local_address = frag->rdma.local_address;
-    void *context = frag->rdma.context;
-    void *cbdata = frag->rdma.cbdata;
-    mca_btl_base_rdma_completion_fn_t cbfunc = frag->rdma.cbfunc;
-
-    hdr = (mca_btl_vader_sc_emu_hdr_t *) frag->segments[0].seg_addr.pval;
-
-    *((int64_t *) frag->rdma.local_address) = hdr->operand[0];
-
-    /* return the fragment first since the callback may call put/get/amo and could use this fragment */
-    MCA_BTL_VADER_FRAG_RETURN(frag);
-
-    cbfunc (btl, endpoint, local_address, NULL, context, cbdata, status);
+    size_t size = (flags & MCA_BTL_ATOMIC_FLAG_32BIT) ? 4 : 8;
+    return mca_btl_vader_rdma_frag_start (btl, endpoint, MCA_BTL_VADER_OP_ATOMIC, operand, 0, op, order, flags,
+                                          size, NULL, remote_address, cbfunc, cbcontext, cbdata);
 }
 
 int mca_btl_vader_emu_afop (struct mca_btl_base_module_t *btl, struct mca_btl_base_endpoint_t *endpoint,
@@ -76,19 +33,9 @@ int mca_btl_vader_emu_afop (struct mca_btl_base_module_t *btl, struct mca_btl_ba
                             uint64_t operand, int flags, int order, mca_btl_base_rdma_completion_fn_t cbfunc,
                             void *cbcontext, void *cbdata)
 {
-    mca_btl_vader_frag_t *frag;
-
-    frag = mca_btl_vader_rdma_frag_alloc (btl, endpoint, MCA_BTL_VADER_OP_ATOMIC, operand, 0, op, 0, order, flags,
-                                          local_address, remote_address, cbfunc, cbcontext, cbdata,
-                                          mca_btl_vader_sc_emu_afop_complete);
-    if (OPAL_UNLIKELY(NULL == frag)) {
-        return OPAL_ERR_OUT_OF_RESOURCE;
-    }
-
-    /* send is always successful */
-    (void) mca_btl_vader_send (btl, endpoint, &frag->base, MCA_BTL_TAG_VADER);
-
-    return OPAL_SUCCESS;
+    size_t size = (flags & MCA_BTL_ATOMIC_FLAG_32BIT) ? 4 : 8;
+    return mca_btl_vader_rdma_frag_start (btl, endpoint, MCA_BTL_VADER_OP_ATOMIC, operand, 0, op, order, flags,
+                                          size, local_address, remote_address, cbfunc, cbcontext, cbdata);
 }
 
 int mca_btl_vader_emu_acswap (struct mca_btl_base_module_t *btl, struct mca_btl_base_endpoint_t *endpoint,
@@ -96,17 +43,7 @@ int mca_btl_vader_emu_acswap (struct mca_btl_base_module_t *btl, struct mca_btl_
                               mca_btl_base_registration_handle_t *remote_handle, uint64_t compare, uint64_t value, int flags,
                               int order, mca_btl_base_rdma_completion_fn_t cbfunc, void *cbcontext, void *cbdata)
 {
-    mca_btl_vader_frag_t *frag;
-
-    frag = mca_btl_vader_rdma_frag_alloc (btl, endpoint, MCA_BTL_VADER_OP_CSWAP, compare, value, 0, 0, order,
-                                          flags, local_address, remote_address, cbfunc, cbcontext, cbdata,
-                                          mca_btl_vader_sc_emu_afop_complete);
-    if (OPAL_UNLIKELY(NULL == frag)) {
-        return OPAL_ERR_OUT_OF_RESOURCE;
-    }
-
-    /* send is always successful */
-    (void) mca_btl_vader_send (btl, endpoint, &frag->base, MCA_BTL_TAG_VADER);
-
-    return OPAL_SUCCESS;
+    size_t size = (flags & MCA_BTL_ATOMIC_FLAG_32BIT) ? 4 : 8;
+    return mca_btl_vader_rdma_frag_start (btl, endpoint, MCA_BTL_VADER_OP_CSWAP, compare, value, 0, order,
+                                          flags, size, local_address, remote_address, cbfunc, cbcontext, cbdata);
 }
diff --git a/opal/mca/btl/vader/btl_vader_component.c b/opal/mca/btl/vader/btl_vader_component.c
index 5a163f637a..98ac462b71 100644
--- a/opal/mca/btl/vader/btl_vader_component.c
+++ b/opal/mca/btl/vader/btl_vader_component.c
@@ -21,6 +21,7 @@
  * Copyright (c) 2018      Amazon.com, Inc. or its affiliates.  All Rights reserved.
  * Copyright (c) 2018      Triad National Security, LLC. All rights
  *                         reserved.
+ * Copyright (c) 2019      Google, Inc. All rights reserved.
  * $COPYRIGHT$
  *
  * Additional copyrights may follow
@@ -477,12 +478,6 @@ static void mca_btl_vader_check_single_copy (void)
         mca_btl_vader.super.btl_get = NULL;
         mca_btl_vader.super.btl_put = NULL;
     }
-
-    if (MCA_BTL_VADER_EMUL == mca_btl_vader_component.single_copy_mechanism) {
-        /* limit to the maximum fragment size */
-        mca_btl_vader.super.btl_put_limit = mca_btl_vader.super.btl_max_send_size - sizeof (mca_btl_vader_sc_emu_hdr_t);
-        mca_btl_vader.super.btl_get_limit = mca_btl_vader.super.btl_max_send_size - sizeof (mca_btl_vader_sc_emu_hdr_t);
-    }
 }
 
 /*
diff --git a/opal/mca/btl/vader/btl_vader_frag.h b/opal/mca/btl/vader/btl_vader_frag.h
index d3ce21dae3..2de2691481 100644
--- a/opal/mca/btl/vader/btl_vader_frag.h
+++ b/opal/mca/btl/vader/btl_vader_frag.h
@@ -14,6 +14,7 @@
  * Copyright (c) 2009      Cisco Systems, Inc.  All rights reserved.
  * Copyright (c) 2011-2015 Los Alamos National Security, LLC. All rights
  *                         reserved.
+ * Copyright (c) 2019      Google, Inc. All rights reserved.
  * $COPYRIGHT$
  *
  * Additional copyrights may follow
@@ -91,9 +92,12 @@ struct mca_btl_vader_frag_t {
     /** rdma callback data */
     struct mca_btl_vader_rdma_cbdata_t {
         void *local_address;
+        uint64_t remote_address;
         mca_btl_base_rdma_completion_fn_t cbfunc;
         void *context;
         void *cbdata;
+        size_t remaining;
+        size_t sent;
     } rdma;
 };
 
@@ -151,28 +155,87 @@ static inline void mca_btl_vader_frag_complete (mca_btl_vader_frag_t *frag) {
 
 int mca_btl_vader_frag_init (opal_free_list_item_t *item, void *ctx);
 
-static inline mca_btl_vader_frag_t *
-mca_btl_vader_rdma_frag_alloc (mca_btl_base_module_t *btl, mca_btl_base_endpoint_t *endpoint, int type,
-                               uint64_t operand1, uint64_t operand2, mca_btl_base_atomic_op_t op, int order,
-                               int flags, size_t size, void *local_address, int64_t remote_address,
-                               mca_btl_base_rdma_completion_fn_t cbfunc, void *cbcontext,
-                               void *cbdata, mca_btl_base_completion_fn_t des_cbfunc)
+static inline void mca_btl_vader_rdma_frag_advance (mca_btl_base_module_t *btl, mca_btl_base_endpoint_t *endpoint,
+                                                    mca_btl_vader_frag_t *frag, int status)
 {
-    mca_btl_vader_sc_emu_hdr_t *hdr;
-    size_t total_size = size + sizeof (*hdr);
-    mca_btl_vader_frag_t *frag;
+    mca_btl_vader_sc_emu_hdr_t *hdr = (mca_btl_vader_sc_emu_hdr_t *) frag->segments[0].seg_addr.pval;
+    mca_btl_base_rdma_completion_fn_t cbfunc = frag->rdma.cbfunc;
+    size_t hdr_size = sizeof (*hdr);
+    size_t len = frag->rdma.sent ? frag->segments[0].seg_len - hdr_size : 0;
+    void *context = frag->rdma.context;
+    void *cbdata = frag->rdma.cbdata;
+    void *data = (void *) (hdr + 1);
 
-    frag = (mca_btl_vader_frag_t *) mca_btl_vader_alloc (btl, endpoint, order, total_size,
-                                                         MCA_BTL_DES_SEND_ALWAYS_CALLBACK);
-    if (OPAL_UNLIKELY(NULL == frag)) {
-        return NULL;
+    if (frag->rdma.sent) {
+        if (MCA_BTL_VADER_OP_GET == hdr->type) {
+            memcpy (frag->rdma.local_address, data, len);
+        } else if ((MCA_BTL_VADER_OP_ATOMIC == hdr->type || MCA_BTL_VADER_OP_CSWAP == hdr->type) &&
+                   frag->rdma.local_address) {
+            if (8 == len) {
+                *((int64_t *) frag->rdma.local_address) = hdr->operand[0];
+            } else {
+                *((int32_t *) frag->rdma.local_address) = (int32_t) hdr->operand[0];
+            }
+        }
     }
 
-    frag->base.des_cbfunc = des_cbfunc;
+    if (frag->rdma.remaining) {
+        size_t packet_size = (frag->rdma.remaining + hdr_size) <= mca_btl_vader.super.btl_max_send_size ?
+            frag->rdma.remaining : mca_btl_vader.super.btl_max_send_size - hdr_size;
+
+        /* advance the local and remote pointers */
+        frag->rdma.local_address = (void *)((uintptr_t) frag->rdma.local_address + len);
+        frag->rdma.remote_address += len;
+
+        if (MCA_BTL_VADER_OP_PUT == hdr->type) {
+            /* copy the next block into the fragment buffer */
+            memcpy ((void *) (hdr + 1), frag->rdma.local_address, packet_size);
+        }
+
+        hdr->addr = frag->rdma.remote_address;
+        /* clear out the complete flag before sending the fragment again */
+        frag->hdr->flags &= ~MCA_BTL_VADER_FLAG_COMPLETE;
+        frag->segments[0].seg_len = packet_size + sizeof (*hdr);
+        frag->rdma.sent += packet_size;
+        frag->rdma.remaining -= packet_size;
+
+        /* send is always successful */
+        (void) mca_btl_vader_send (btl, endpoint, &frag->base, MCA_BTL_TAG_VADER);
+        return;
+    }
+
+    /* return the fragment before calling the callback */
+    MCA_BTL_VADER_FRAG_RETURN(frag);
+    cbfunc (btl, endpoint, (void *)((uintptr_t) frag->rdma.local_address - frag->rdma.sent), NULL,
+            context, cbdata, status);
+}
+
+static inline int
+mca_btl_vader_rdma_frag_start (mca_btl_base_module_t *btl, mca_btl_base_endpoint_t *endpoint, int type,
+                               uint64_t operand1, uint64_t operand2, mca_btl_base_atomic_op_t op, int order,
+                               int flags, size_t size, void *local_address, int64_t remote_address,
+                               mca_btl_base_rdma_completion_fn_t cbfunc, void *cbcontext, void *cbdata)
+{
+    mca_btl_vader_sc_emu_hdr_t *hdr;
+    size_t hdr_size = sizeof (*hdr);
+    size_t packet_size = (size + hdr_size) <= mca_btl_vader.super.btl_max_send_size ? size :
+        mca_btl_vader.super.btl_max_send_size - hdr_size;
+    mca_btl_vader_frag_t *frag;
+
+    frag = (mca_btl_vader_frag_t *) mca_btl_vader_alloc (btl, endpoint, order, packet_size + hdr_size,
+                                                         MCA_BTL_DES_SEND_ALWAYS_CALLBACK);
+    if (OPAL_UNLIKELY(NULL == frag)) {
+        return OPAL_ERR_OUT_OF_RESOURCE;
+    }
+
+    frag->base.des_cbfunc = (mca_btl_base_completion_fn_t) mca_btl_vader_rdma_frag_advance;
     frag->rdma.local_address = local_address;
+    frag->rdma.remote_address = remote_address;
     frag->rdma.cbfunc = cbfunc;
     frag->rdma.context = cbcontext;
     frag->rdma.cbdata = cbdata;
+    frag->rdma.remaining = size;
+    frag->rdma.sent = 0;
 
     hdr = (mca_btl_vader_sc_emu_hdr_t *) frag->segments[0].seg_addr.pval;
 
@@ -183,7 +246,8 @@ mca_btl_vader_rdma_frag_alloc (mca_btl_base_module_t *btl, mca_btl_base_endpoint
     hdr->operand[0] = operand1;
     hdr->operand[1] = operand2;
 
-    return frag;
+    mca_btl_vader_rdma_frag_advance (btl, endpoint, frag, OPAL_SUCCESS);
+    return OPAL_SUCCESS;
 }
 
 #endif /* MCA_BTL_VADER_SEND_FRAG_H */
diff --git a/opal/mca/btl/vader/btl_vader_get.c b/opal/mca/btl/vader/btl_vader_get.c
index db4b678ef1..a71203f1ad 100644
--- a/opal/mca/btl/vader/btl_vader_get.c
+++ b/opal/mca/btl/vader/btl_vader_get.c
@@ -4,6 +4,7 @@
  *                         reserved.
  * Copyright (c) 2018      Research Organization for Information Science
  *                         and Technology (RIST).  All rights reserved.
+ * Copyright (c) 2019      Google, Inc. All rights reserved.
  * $COPYRIGHT$
  *
  * Additional copyrights may follow
@@ -156,49 +157,15 @@ int mca_btl_vader_get_knem (mca_btl_base_module_t *btl, mca_btl_base_endpoint_t
 }
 #endif
 
-static void mca_btl_vader_sc_emu_get_complete (mca_btl_base_module_t *btl, mca_btl_base_endpoint_t *endpoint,
-                                               mca_btl_base_descriptor_t *desc, int status)
-{
-    mca_btl_vader_frag_t *frag = (mca_btl_vader_frag_t *) desc;
-    mca_btl_vader_sc_emu_hdr_t *hdr;
-    void *local_address = frag->rdma.local_address;
-    size_t len = frag->segments[0].seg_len - sizeof (*hdr);
-    void *context = frag->rdma.context;
-    void *cbdata = frag->rdma.cbdata;
-    mca_btl_base_rdma_completion_fn_t cbfunc = frag->rdma.cbfunc;
-    void *data;
-
-    hdr = (mca_btl_vader_sc_emu_hdr_t *) frag->segments[0].seg_addr.pval;
-    data = (void *) (hdr + 1);
-
-    memcpy (local_address, data, len);
-
-    /* return the fragment before calling the callback */
-    MCA_BTL_VADER_FRAG_RETURN(frag);
-
-    cbfunc (btl, endpoint, local_address, NULL, context, cbdata, status);
-}
-
 int mca_btl_vader_get_sc_emu (mca_btl_base_module_t *btl, mca_btl_base_endpoint_t *endpoint, void *local_address,
                               uint64_t remote_address, mca_btl_base_registration_handle_t *local_handle,
                               mca_btl_base_registration_handle_t *remote_handle, size_t size, int flags,
                               int order, mca_btl_base_rdma_completion_fn_t cbfunc, void *cbcontext, void *cbdata)
 {
-    mca_btl_vader_frag_t *frag;
-
     if (size > mca_btl_vader.super.btl_get_limit) {
         return OPAL_ERR_NOT_AVAILABLE;
     }
 
-    frag = mca_btl_vader_rdma_frag_alloc (btl, endpoint, MCA_BTL_VADER_OP_GET, 0, 0, 0, order, flags, size,
-                                          local_address, remote_address, cbfunc, cbcontext, cbdata,
-                                          mca_btl_vader_sc_emu_get_complete);
-    if (OPAL_UNLIKELY(NULL == frag)) {
-        return OPAL_ERR_OUT_OF_RESOURCE;
-    }
-
-    /* send is always successful */
-    (void) mca_btl_vader_send (btl, endpoint, &frag->base, MCA_BTL_TAG_VADER);
-
-    return OPAL_SUCCESS;
+    return mca_btl_vader_rdma_frag_start (btl, endpoint, MCA_BTL_VADER_OP_GET, 0, 0, 0, order, flags, size,
+                                          local_address, remote_address, cbfunc, cbcontext, cbdata);
 }
diff --git a/opal/mca/btl/vader/btl_vader_put.c b/opal/mca/btl/vader/btl_vader_put.c
index 0224d2fe19..8e47a70332 100644
--- a/opal/mca/btl/vader/btl_vader_put.c
+++ b/opal/mca/btl/vader/btl_vader_put.c
@@ -4,6 +4,7 @@
  *                         reserved.
  * Copyright (c) 2014-2018 Research Organization for Information Science
  *                         and Technology (RIST).  All rights reserved.
+ * Copyright (c) 2019      Google, Inc. All rights reserved.
  * $COPYRIGHT$
  *
  * Additional copyrights may follow
@@ -135,21 +136,6 @@ int mca_btl_vader_put_knem (mca_btl_base_module_t *btl, mca_btl_base_endpoint_t
 }
 #endif
 
-static void mca_btl_vader_sc_emu_put_complete (mca_btl_base_module_t *btl, mca_btl_base_endpoint_t *endpoint,
-                                               mca_btl_base_descriptor_t *desc, int status)
-{
-    mca_btl_vader_frag_t *frag = (mca_btl_vader_frag_t *) desc;
-    void *local_address = frag->rdma.local_address;
-    void *context = frag->rdma.context;
-    void *cbdata = frag->rdma.cbdata;
-    mca_btl_base_rdma_completion_fn_t cbfunc = frag->rdma.cbfunc;
-
-    /* return the fragment first since the callback may call put/get/amo and could use this fragment */
-    MCA_BTL_VADER_FRAG_RETURN(frag);
-
-    cbfunc (btl, endpoint, local_address, NULL, context, cbdata, status);
-}
-
 /**
  * @brief Provides an emulated put path which uses copy-in copy-out with shared memory buffers
  */
@@ -158,26 +144,10 @@ int mca_btl_vader_put_sc_emu (mca_btl_base_module_t *btl, mca_btl_base_endpoint_
                               mca_btl_base_registration_handle_t *remote_handle, size_t size, int flags,
                               int order, mca_btl_base_rdma_completion_fn_t cbfunc, void *cbcontext, void *cbdata)
 {
-    mca_btl_vader_sc_emu_hdr_t *hdr;
-    mca_btl_vader_frag_t *frag;
-
     if (size > mca_btl_vader.super.btl_put_limit) {
         return OPAL_ERR_NOT_AVAILABLE;
     }
 
-    frag = mca_btl_vader_rdma_frag_alloc (btl, endpoint, MCA_BTL_VADER_OP_PUT, 0, 0, 0, order, flags, size,
-                                          local_address, remote_address, cbfunc, cbcontext, cbdata,
-                                          mca_btl_vader_sc_emu_put_complete);
-    if (OPAL_UNLIKELY(NULL == frag)) {
-        return OPAL_ERR_OUT_OF_RESOURCE;
-    }
-
-    hdr = (mca_btl_vader_sc_emu_hdr_t *) frag->segments[0].seg_addr.pval;
-
-    memcpy ((void *) (hdr + 1), local_address, size);
-
-    /* send is always successful */
-    (void) mca_btl_vader_send (btl, endpoint, &frag->base, MCA_BTL_TAG_VADER);
-
-    return OPAL_SUCCESS;
+    return mca_btl_vader_rdma_frag_start (btl, endpoint, MCA_BTL_VADER_OP_PUT, 0, 0, 0, order, flags, size,
+                                          local_address, remote_address, cbfunc, cbcontext, cbdata);
 }